In this file we record the changes since the first GAP 4 release of
the GUAVA package.

Version 3.9 (12-2008):
   o Fix for BCH decoder bug reported by Heiko Dietrich.
   o Fix for MinimumDistanceLeon bug reported by Jorge Ernesto 
     Perez Chamorro

Version 3.8 (11-2008):
   o Fix for C code computing minimum distance written by CJ Tjhal

Version 3.7 (08-2008):
   o Fix to leonconv.c reported by Klaus Lux.
   o Fix to libtool problem in leon configure script, 
     reported by Petr Salinger and Timothy Abbott.

Version 3.6 (06-2008):
   o Added QCLDPCCodeFromGroup function.
   o Improved HadamardMat.
   o Corrected a missing ';' in Makefile.in, as well as several
     other minor make edits (thanks to Timothy Abbott)
   o Updated documentation.

Version 3.5 (04-2008):
   o Minor changes (permission changes, etc)

Version 3.4 (03-2008):
   o Modified the configure file for the C code (R. Miller).
   o Updated documentation.

Version 3.3 (03-2008):
   o Added new C code written by CJ and a new Guava function MinimumWeight
     which is *much* faster than MinimumDistance (when the ground
     field is GF(2) or GF(3)).
   o Added Andreas Brouwer's patch for Leon's code to avoid some
     memory problems.

Version 3.2 (01-2008):
   o Added a macro for malloc.h in leonconv.c to fix compilation error
     under Mac OS X
   o Added ExtendedReedSolomonCode, QuasiCyclicCode, CyclicMDSCode, 
     FourNegacirculantSelfDualCode, ConstructionXCode, ConstructionXXCode,
     BZCode, IsDoublyEvenCode, IsSinglyEvenCode and IsEvenCode functions.

Version 3.1 (10-2007):
   o Fixed a bug in MinimumDistance reported by Lappas Eleftherios.
   o William Stein fixed a compilation bug.
   o Fixed XML bugs pointed out by Frank Luebeck and Max Neunhoeffer

Version 3.0: (7-2007) 
   o Robert Miller and Tom Boothby added as authors. 
   o Leon's code is now GPL'd (many thanks to Vera Pless 
     and Steve Smith)! Robert and Tom are working on rewriting 
     the code and have already fixed some bugs, compiling errors, 
     and memory problems.
   o Fixed several bugs reported by Punarbasu Purkayastha (a EE
     grad student at the Univ of Maryland) in Decode, Decodeword
     for ReedSolomon codes, as well as a problem in the
     GUAVA documentation.
   o Re-united the "odd" and "even" forks of the GUAVA code.

Version 2.8: Forked off a branch of GUAVA which is entirely
GPL'd code. (None of Leon's code is included.) Otherwise, same
as 2.7. This branch is used in SAGE (sage.scipy.org).

Version 2.7: (5-2005) 
   o Cen Tjhai ("CJ") added as author.
   o cjt: Complete rewrite of the files in the tbl subdirectory. 
     There are (as of May 11, 2006) as updated as Brouwer's
     online tables (www.win.tue.nl/~aeb/voorlincod.html).
   o cjt: Created two functions in codeman.g*, SubCode and 
     ConstructionB2Code. The ConstructionB2Code function is empty
     and to be implemented in a future version.
   o wdj: GUAVA Manual changes.

Version 2.6: Forked off a branch of GUAVA which is entirely
GPL'd code. (None of Leon's code is included.) Otherwise, same
as 2.5. This branch is used in SAGE (sage.scipy.org).

Version 2.5: (1-2006) 
   o Fixed undesired feature in Decodeword (spotten by Cayanne 
     McFarlane).
   o Added MinimumWeightWords to manual; modified GAP code
     for MinimumWeightWords to speed it up. 
   o Modified CheckMatCode to "Set" *mutable* generator
     and check matrices.
   o Added BitFlipDecoder, a fast decoder for LDPC codes 
     (written with Gordon McDonald).
   o Added GuavaVersion and guava_version
   o Added FerrorDesignCode, written with Peter Mayr at Linz
     (one of the SONATA authors). This requires SONATA be
     loaded.
   o Added QQRCodeNC (written with Greg Coy).
   o Miscellaneous additions to the GUAVA manual.

Version 2.4: (6-2005) Minor bug fix - 
   o In MatrixRepresentationOnRiemannRochSpaceP1,
     cleaned up code and fixed a bug (GAP does not process 1 the 
     same as x^0 in some cases).
   o Fixed spelling error in guava.tst file.

Version 2.3: (5-2005)
   o added PermutationDecoderNC, CyclicDecoder
   o change PermutationGroup in PermutationDecoder
     to PermutationAutomorphismGroup 
   o in codegen.gi, line 2066, replace C.GeneratorMat 
     by C.EvaluationMat, and then add the existence of this extra 
     record component to the documentation 
   o classical Goppa = AG codes over P^1
   o curve record data structure for plane curves 
     and some associated functions
   o divisor record data structure for curves (only used for P^1)
     and some associated functions
   o automorphism group of a divisor on P^1 (very slow)
   o function computing matrix representation of group 
     action on Riemann-Roch space (in P^1 case only, also
     very slow)
   o one point AG codes
   o nicer evaluation codes in 2-d
   o miscellaneous functions for multivariate polynomials
   o new section on algebraic geometric codes in manual

Version 2.0002 (5-2005)
   o A renaming of GUAVA 2.0, for the GAP 4.4.5 release.

Version 2.0001: (12-2004)
   o Merely aded PolynomialByExtRepNC to GUAVA. (A *temporary* addition to 
     last until GAP 4.4.5 was released.)

Version 2.0: (12-2004)
   o Changed `ViewObj` method for random linear codes, 
     speeding up the implementation of the RandomLinearCode command.
   o Modified BCHCode and RootsCode implementation.
   o Corrected bug in UpperBoundElias.
   o Rewrote GUAVA documentation into GAPDoc, with many revisions.
   o Added EvaluationCode and related codes
     (GeneralizedReedMullerCode, GeneralizedReedSolomonCode, 
      OnePointAGCode, joint with Jason McGowan)
   o Added interpolation decoding method for GeneralizedReedSolomonCode
     (joint with Jason McGowan), GeneralizedReedSolomonDecoder.
   o Added S. Gao decoding method for GeneralizedReedSolomonCode,
     GeneralizedReedSolomonDecoderGao.
   o Fixed bug in MinimumDistance (wrong result if G=(I|A)
     and A had a row of 0s)
   o MinimumDistanceRandom algorithm implemented in non-binary case
     (joint with Wayne Irons).
   o Added list-decoding algorithm GeneralizedReedSolomonListDecoder
     (joint with Clifton Lennon) and related commands
     (some undocumented). 
   o Bug fix for SortedGaloisFieldElements (used to construct
     Gabidulin codes).
   o CalculateLinearCodeCoveringRadius changed to a slightly faster
     algorithm.
   o minor bug fix for ExhaustiveSearchCoveringRadius
   o minor bug fix for IncreaseCoveringRadiusLowerBound
   o Changed ConstantWeightSubcode so it does not call Leon's
     program if wtdist is not installed. Moreover, the procedure 
     interfacing with the binary had a bug, which was fixed.
   o Added check in AutomorphismGroup: if Leon's desauto is not
     compiled (e.g., on a windows machine) then it calls PermutationGroup 
     command instead.
   o Added Decodeword (which also works for non-linear codes)
   o Added NearestNeighborDecodewords (for linear codes)
   o Added NearestNeighborGRSDecodewords (for GRS codes)
   o Added PermutationAutomorphismGroup (which will replace the
     poorly named PermutationGroup command added in version 1.9)
   o Moved several decoding commands from codeops.gi to decoders.gi
     (with no change in functionality).
   o Added LowerBoundGilbertVarshamov and LowerBoundSpherePacking.
   o Added DivisorsMultivariatePolynomial and related commands
     (some undocumented). 
   o Released under the GNU GPL.

Version 1.9: (3-2004)
   o Faster MinimumDistance algorithm (joint with Aron Foster, a student).
   o MinimumDistanceLeon algorithm (joint with Aron Foster) in 
     binary case.
   o Faster PutStandard form algorithm (with Frank Luebeck).
   o New PermutationGroup command (for possibly non-binary codes).
   o New PermutationDecode command.

Version 1.82: (7-2003)
   o Slight changes to prepare for the different loading 
     mechanism for GAP packages used in the upcoming GAP 4.4.

Version 1.8: 
   o New commands for toric codes. 

Version 1.7: (2-2003)
   o Various typos in manual fixed.
   o lib/codecstr.g[di]:
       `AmalgamatedDirectSumCode' previously misspelt as 
       `AmalgatedDirectSumCode' corrected.
   o Version Id headers in doc/* and lib/* files added.
   o README:
       updated.
   o init.g:
       now checks the C code has been compiled and warns of
       missing functionality if not compiled.
   o banner.g, lib/setup.g:
       banner split off as a separate file.
   o PkgInfo.g, CHANGES (this file):
       added.

Version 1.6: (9-2001)
   New maintainer: David Joyner.
   o Bugs in `IsAffineCode' and `MinimumDistance' (reported by
     Akihiro Munemasa, who also supplied a fix for the `IsAffineCode'
     bug) fixed.
   o Manual thoroughly reworked. HTML manual made available.

Version 1.5:
   GAP 4.2 version. Not compatible with GAP 4.1.

Version 1.4:
   First GAP4 version by Lea Ruscio. Created for GAP 4.1. 
   Incompatible with GAP 4.2.

Version 1.3:
   Last GAP3 version.

   - David Joyner -- Auguest 19, 2008
