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

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          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.
        
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          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.
        
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          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:
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            You must cause the modified files to carry prominent notices stating that you changed the
               files and the date of any change.
               
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            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.
               
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            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.
        
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          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:
        7:;z+e~2VH|[LV3D
            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,
               
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            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,
               
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            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.
        
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          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.
        
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          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.
        
5(O.a
          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.
        
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          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.
        
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          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.
        
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          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.
        
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          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
        
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          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.
        
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          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.
      