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==========================
GNU GENERAL PUBLIC LICENSE
==========================

**Version 2, June 1991**

    Copyright (C) 1989, 1991 Free Software Foundation, Inc.  
    51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA

    Everyone is permitted to copy and distribute verbatim copies
    of this license document, but changing it is not allowed.


Preamble
========

The licenses for most software are designed to take away your freedom
to share and  change it. By contrast, the GNU  General Public License
is  intended to  guarantee  your  freedom to  share  and change  free
software--to make sure  the software is free for all  its users. This
General  Public  License  applies  to   most  of  the  Free  Software
Foundation's software and  to any other program  whose authors commit
to using it. (Some other Free Software Foundation software is covered
by the GNU  Lesser General Public License instead.) You  can apply it
to your programs, too.

When we  speak of  free software,  we are  referring to  freedom, not
price. Our General Public Licenses are designed to make sure that you
have the  freedom to distribute  copies of free software  (and charge
for this  service if you wish),  that you receive source  code or can
get it if you want it, that you can change the software or use pieces
of  it in  new free  programs; and  that you  know you  can do  these
things.

To  protect your  rights, we  need to  make restrictions  that forbid
anyone  to deny  you these  rights  or to  ask you  to surrender  the
rights.  These restrictions translate to certain responsibilities for
you if you distribute copies of the software, or if you modify it.

For  example, if  you distribute  copies of  such a  program, whether
gratis or for a fee, you must give the recipients all the rights that
you have. You must  make sure that they, too, receive  or can get the
source code.  And you must show  them these terms so  they know their
rights.

We protect  your rights with  two steps: (1) copyright  the software,
and (2)  offer you this license  which gives you legal  permission to
copy, distribute and/or modify the software.

Also, for each author's protection and  ours, we want to make certain
that everyone  understands that  there is no  warranty for  this free
software. If the software is modified  by someone else and passed on,
we  want its  recipients  to know  that  what they  have  is not  the
original, so that any problems  introduced by others will not reflect
on the original authors' reputations.

Finally,  any  free  program  is threatened  constantly  by  software
patents. We  wish to avoid the  danger that redistributors of  a free
program will  individually obtain  patent licenses, in  effect making
the program proprietary. To prevent this,  we have made it clear that
any patent must  be licensed for everyone's free use  or not licensed
at all.

The  precise  terms  and  conditions for  copying,  distribution  and
modification follow.


TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
===============================================================

0. This License applies to any program or other work which contains a
   notice placed by the copyright holder saying it may be distributed
   under the  terms of  this General  Public License.  The "Program",
   below, refers  to any such program  or work, and a  "work based on
   the Program" means either the Program or any derivative work under
   copyright law: that is to say,  a work containing the Program or a
   portion  of  it,  either  verbatim or  with  modifications  and/or
   translated  into another  language.  (Hereinafter, translation  is
   included  without limitation  in  the  term "modification".)  Each
   licensee is addressed as "you".

   Activities other  than copying, distribution and  modification are
   not covered by  this License; they are outside its  scope. The act
   of running the Program is not  restricted, and the output from the
   Program is covered only if its contents constitute a work based on
   the  Program  (independent of  having  been  made by  running  the
   Program). Whether that is true depends on what the Program does.

1. You  may copy  and  distribute verbatim  copies  of the  Program's
   source code  as you receive it,  in any medium, provided  that you
   conspicuously   and  appropriately   publish  on   each  copy   an
   appropriate  copyright notice  and  disclaimer  of warranty;  keep
   intact  all the  notices that  refer to  this License  and to  the
   absence  of any  warranty; and  give any  other recipients  of the
   Program a copy of this License along with the Program.

   You may charge a fee for  the physical act of transferring a copy,
   and you may  at your option offer warranty  protection in exchange
   for a fee.

2. You may modify  your copy or copies of the  Program or any portion
   of it,  thus forming  a work  based on the  Program, and  copy and
   distribute such modifications or work under the terms of Section 1
   above, provided that you also meet all of these conditions:
  
   a) You must  cause the modified  files to carry  prominent notices
      stating that you changed the files and the date of any change.

   b) You must cause any work that you distribute or publish, that in
      whole or in part contains or is derived from the Program or any
      part thereof,  to be licensed  as a whole  at no charge  to all
      third parties under the terms of this License.

   c) If the  modified program normally reads  commands interactively
      when  run, you  must cause  it, when  started running  for such
      interactive use in  the most ordinary way, to  print or display
      an announcement including an appropriate copyright notice and a
      notice  that there  is no  warranty (or  else, saying  that you
      provide a warranty) and that users may redistribute the program
      under these conditions, and telling the user how to view a copy
      of  this   License.  (Exception:  if  the   Program  itself  is
      interactive but  does not normally print  such an announcement,
      your work  based on  the Program  is not  required to  print an
      announcement.)

   These  requirements apply  to the  modified  work as  a whole.  If
   identifiable  sections  of that  work  are  not derived  from  the
   Program, and can be reasonably considered independent and separate
   works  in themselves,  then this  License, and  its terms,  do not
   apply  to those  sections  when you  distribute  them as  separate
   works. But  when you  distribute the  same sections  as part  of a
   whole which  is a work based  on the Program, the  distribution of
   the whole must be on the  terms of this License, whose permissions
   for other licensees  extend to the entire whole, and  thus to each
   and every part regardless of who wrote it.
   
   Thus, it  is not  the intent  of this section  to claim  rights or
   contest your rights  to work written entirely by  you; rather, the
   intent is  to exercise  the right to  control the  distribution of
   derivative or collective works based on the Program.
   
   In addition,  mere aggregation  of another work  not based  on the
   Program with the Program (or with  a work based on the Program) on
   a volume  of a storage or  distribution medium does not  bring the
   other work under the scope of this License.

3. You may  copy and distribute the  Program (or a work  based on it,
   under Section 2) in object code or executable form under the terms
   of Sections  1 and 2  above provided that you  also do one  of the
   following:

   a) Accompany it  with the complete  corresponding machine-readable
      source  code, which  must  be distributed  under  the terms  of
      Sections  1  and 2  above  on  a  medium customarily  used  for
      software interchange; or,

   b) Accompany it  with a  written offer, valid  for at  least three
      years, to give any third party,  for a charge no more than your
      cost of  physically performing source distribution,  a complete
      machine-readable copy  of the corresponding source  code, to be
      distributed under  the terms  of Sections  1 and  2 above  on a
      medium customarily used for software interchange; or,

   c) Accompany it with the information  you received as to the offer
      to distribute  corresponding source code. (This  alternative is
      allowed  only for  noncommercial distribution  and only  if you
      received the  program in  object code  or executable  form with
      such an offer, in accord with Subsection b above.)

   The source  code for a work  means the preferred form  of the work
   for making modifications  to it. For an  executable work, complete
   source code means all the source code for all modules it contains,
   plus any  associated interface definition files,  plus the scripts
   used   to   control   compilation    and   installation   of   the
   executable.  However,  as a  special  exception,  the source  code
   distributed need not include anything that is normally distributed
   (in  either  source or  binary  form)  with the  major  components
   (compiler, kernel, and so on) of the operating system on which the
   executable  runs, unless  that  component  itself accompanies  the
   executable.
   
   If distribution of  executable or object code is  made by offering
   access to copy  from a designated place,  then offering equivalent
   access  to copy  the source  code from  the same  place counts  as
   distribution of the source code, even though third parties are not
   compelled to copy the source along with the object code.

4. You may  not copy, modify,  sublicense, or distribute  the Program
   except  as  expressly provided  under  this  License. Any  attempt
   otherwise to copy, modify, sublicense or distribute the Program is
   void,  and will  automatically  terminate your  rights under  this
   License.  However, parties  who have  received copies,  or rights,
   from  you  under  this  License   will  not  have  their  licenses
   terminated so long as such parties remain in full compliance.

5. You are  not required to accept  this License, since you  have not
   signed it. However,  nothing else grants you  permission to modify
   or distribute the  Program or its derivative  works. These actions
   are   prohibited   by   law   if    you   do   not   accept   this
   License. Therefore,  by modifying or distributing  the Program (or
   any work  based on the  Program), you indicate your  acceptance of
   this  License to  do  so, and  all its  terms  and conditions  for
   copying, distributing or  modifying the Program or  works based on
   it.

6. Each time you  redistribute the Program (or any work  based on the
   Program), the recipient automatically  receives a license from the
   original  licensor  to  copy,  distribute or  modify  the  Program
   subject  to these  terms and  conditions. You  may not  impose any
   further  restrictions on  the recipients'  exercise of  the rights
   granted herein.  You are  not responsible for enforcing compliance
   by third parties to this License.

7. If, as a  consequence of a court judgment or  allegation of patent
   infringement  or  for any  other  reason  (not limited  to  patent
   issues), conditions  are imposed on  you (whether by  court order,
   agreement  or otherwise)  that contradict  the conditions  of this
   License,  they do  not  excuse  you from  the  conditions of  this
   License.  If you cannot distribute so as to satisfy simultaneously
   your  obligations  under  this  License and  any  other  pertinent
   obligations,  then as  a consequence  you may  not distribute  the
   Program at all. For example, if  a patent license would not permit
   royalty-free  redistribution  of  the  Program by  all  those  who
   receive copies directly  or indirectly through you,  then the only
   way you could satisfy both it and this License would be to refrain
   entirely from distribution of the Program.
   
   If any  portion of this  section is held invalid  or unenforceable
   under any particular  circumstance, the balance of  the section is
   intended to apply and the section  as a whole is intended to apply
   in other circumstances.
   
   It is  not the purpose of  this section to induce  you to infringe
   any patents or other property  right claims or to contest validity
   of  any  such  claims;  this  section  has  the  sole  purpose  of
   protecting the integrity of the free software distribution system,
   which is implemented by public license practices. Many people have
   made  generous  contributions  to   the  wide  range  of  software
   distributed  through   that  system  in  reliance   on  consistent
   application of that system; it is up to the author/donor to decide
   if he or  she is willing to distribute software  through any other
   system and a licensee cannot impose that choice.
   
   This section is intended to make thoroughly clear what is believed
   to be a consequence of the rest of this License.

8. If the  distribution and/or  use of the  Program is  restricted in
   certain countries either by  patents or by copyrighted interfaces,
   the original  copyright holder who  places the Program  under this
   License may  add an explicit geographical  distribution limitation
   excluding those countries, so  that distribution is permitted only
   in  or among  countries  not  thus excluded.  In  such case,  this
   License incorporates the  limitation as if written in  the body of
   this License.

9. The  Free  Software  Foundation  may publish  revised  and/or  new
   versions of the General Public License from time to time. Such new
   versions will be similar in spirit to the present version, but may
   differ in detail to address new problems or concerns.
   
   Each  version is  given a  distinguishing version  number. If  the
   Program specifies a  version number of this  License which applies
   to it  and "any later version",  you have the option  of following
   the terms  and conditions either of  that version or of  any later
   version published by the Free  Software Foundation. If the Program
   does not specify a version number  of this License, you may choose
   any version ever published by the Free Software Foundation.

10. If you wish  to incorporate parts of the Program  into other free
    programs whose  distribution conditions  are different,  write to
    the  author  to  ask  for   permission.  For  software  which  is
    copyrighted by  the Free Software  Foundation, write to  the Free
    Software Foundation;  we sometimes make exceptions  for this. Our
    decision will be  guided by the two goals of  preserving the free
    status of all  derivatives of our free software  and of promoting
    the sharing and reuse of software generally.

**NO WARRANTY**

11. BECAUSE  THE PROGRAM  IS LICENSED  FREE  OF CHARGE,  THERE IS  NO
    WARRANTY FOR THE  PROGRAM, TO THE EXTENT  PERMITTED BY APPLICABLE
    LAW.   EXCEPT  WHEN OTHERWISE  STATED  IN  WRITING THE  COPYRIGHT
    HOLDERS AND/OR OTHER PARTIES PROVIDE  THE PROGRAM "AS IS" WITHOUT
    WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT
    NOT  LIMITED TO,  THE IMPLIED  WARRANTIES OF  MERCHANTABILITY AND
    FITNESS  FOR A  PARTICULAR PURPOSE.  THE  ENTIRE RISK  AS TO  THE
    QUALITY AND  PERFORMANCE OF THE  PROGRAM IS WITH YOU.  SHOULD THE
    PROGRAM PROVE  DEFECTIVE, YOU  ASSUME THE  COST OF  ALL NECESSARY
    SERVICING, REPAIR OR CORRECTION.

12. IN NO  EVENT UNLESS REQUIRED  BY APPLICABLE  LAW OR AGREED  TO IN
    WRITING WILL  ANY COPYRIGHT  HOLDER, OR ANY  OTHER PARTY  WHO MAY
    MODIFY  AND/OR REDISTRIBUTE  THE PROGRAM  AS PERMITTED  ABOVE, BE
    LIABLE  TO  YOU  FOR  DAMAGES, INCLUDING  ANY  GENERAL,  SPECIAL,
    INCIDENTAL OR  CONSEQUENTIAL DAMAGES  ARISING OUT  OF THE  USE OR
    INABILITY TO USE  THE PROGRAM (INCLUDING BUT NOT  LIMITED TO LOSS
    OF DATA OR DATA BEING  RENDERED INACCURATE OR LOSSES SUSTAINED BY
    YOU OR THIRD PARTIES OR A  FAILURE OF THE PROGRAM TO OPERATE WITH
    ANY OTHER PROGRAMS), EVEN IF SUCH  HOLDER OR OTHER PARTY HAS BEEN
    ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.


END OF TERMS AND CONDITIONS
===========================


How to Apply These Terms to Your New Programs
=============================================

If you develop a  new program, and you want it to  be of the greatest
possible use to the  public, the best way to achieve  this is to make
it free  software which  everyone can  redistribute and  change under
these terms.

To do so,  attach the following notices to the  program. It is safest
to attach them  to the start of each source  file to most effectively
convey the exclusion of warranty; and  each file should have at least
the "copyright" line and a pointer to where the full notice is found.

    one line to give the program's name  and an idea of what it does.
    Copyright (C) yyyy name of author

    This program  is free  software; you  can redistribute  it and/or
    modify it  under the terms of  the GNU General Public  License as
    published by  the Free Software  Foundation; either version  2 of
    the License, or (at your option) any later version.

    This program is  distributed in the hope that it  will be useful,
    but WITHOUT  ANY WARRANTY; without  even the implied  warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    General Public License for more details.

    You should have received a copy of the GNU General Public License
    along  with this  program; if  not,  write to  the Free  Software
    Foundation,  Inc., 51  Franklin Street,  Fifth Floor,  Boston, MA
    02110-1301, USA.

Also add  information on how to  contact you by electronic  and paper
mail.

If the  program is interactive,  make it  output a short  notice like
this when it starts in an interactive mode: ::

    Gnomovision  version  69,  Copyright  (C)  year  name  of  author
    Gnomovision comes  with ABSOLUTELY NO WARRANTY;  for details type
    "show  w".   This  is  free  software, and  you  are  welcome  to
    redistribute  it  under certain  conditions;  "type  show c"  for
    details.

The hypothetical commands ``"show w"`` and ``"show c"`` should show
the appropriate parts of the General Public License.  Of course, the
commands you use may be called something other than ``"show w"`` and
``"show c"``; they could even be mouse-clicks or menu items--whatever
suits your program.

You should  also get your employer  (if you work as  a programmer) or
your  school,  if any,  to  sign  a  "copyright disclaimer"  for  the
program, if necessary. Here is a sample; alter the names: ::

    Yoyodyne, Inc., hereby disclaims all copyright
    interest in the program `Gnomovision`
    (which makes passes at compilers) written 
    by James Hacker.

    signature of Ty Coon, 1 April 1989
    Ty Coon, President of Vice

This  General  Public  License  does not  permit  incorporating  your
program into  proprietary programs. If  your program is  a subroutine
library,  you  may   consider  it  more  useful   to  permit  linking
proprietary applications with  the library. If this is  what you want
to     do,     use     the     [GNU     Lesser     General     Public
License](https://www.gnu.org/licenses/lgpl.html)   instead  of   this
License.