Remove bzip2 code since it is no longer being used.

third_party/bzip2/README

-
-This is the README for bzip2/libzip2.
-This version is fully compatible with the previous public releases.
-
-------------------------------------------------------------------
-This file is part of bzip2/libbzip2, a program and library for
-lossless, block-sorting data compression.
-
-bzip2/libbzip2 version 1.0.6 of 6 September 2010
-Copyright (C) 1996-2010 Julian Seward <jseward@bzip.org>
-
-Please read the WARNING, DISCLAIMER and PATENTS sections in this file.
-
-This program is released under the terms of the license contained
-in the file LICENSE.
-------------------------------------------------------------------
-
-Complete documentation is available in Postscript form (manual.ps),
-PDF (manual.pdf) or html (manual.html).  A plain-text version of the
-manual page is available as bzip2.txt.
-
-
-HOW TO BUILD -- UNIX
-
-Type 'make'.  This builds the library libbz2.a and then the programs
-bzip2 and bzip2recover.  Six self-tests are run.  If the self-tests
-complete ok, carry on to installation:
-
-To install in /usr/local/bin, /usr/local/lib, /usr/local/man and
-/usr/local/include, type
-
-   make install
-
-To install somewhere else, eg, /xxx/yyy/{bin,lib,man,include}, type
-
-   make install PREFIX=/xxx/yyy
-
-If you are (justifiably) paranoid and want to see what 'make install'
-is going to do, you can first do
-
-   make -n install                      or
-   make -n install PREFIX=/xxx/yyy      respectively.
-
-The -n instructs make to show the commands it would execute, but not
-actually execute them.
-
-
-HOW TO BUILD -- UNIX, shared library libbz2.so.
-
-Do 'make -f Makefile-libbz2_so'.  This Makefile seems to work for
-Linux-ELF (RedHat 7.2 on an x86 box), with gcc.  I make no claims
-that it works for any other platform, though I suspect it probably
-will work for most platforms employing both ELF and gcc.
-
-bzip2-shared, a client of the shared library, is also built, but not
-self-tested.  So I suggest you also build using the normal Makefile,
-since that conducts a self-test.  A second reason to prefer the
-version statically linked to the library is that, on x86 platforms,
-building shared objects makes a valuable register (%ebx) unavailable
-to gcc, resulting in a slowdown of 10%-20%, at least for bzip2.
-
-Important note for people upgrading .so's from 0.9.0/0.9.5 to version
-1.0.X.  All the functions in the library have been renamed, from (eg)
-bzCompress to BZ2_bzCompress, to avoid namespace pollution.
-Unfortunately this means that the libbz2.so created by
-Makefile-libbz2_so will not work with any program which used an older
-version of the library.  I do encourage library clients to make the
-effort to upgrade to use version 1.0, since it is both faster and more
-robust than previous versions.
-
-
-HOW TO BUILD -- Windows 95, NT, DOS, Mac, etc.
-
-It's difficult for me to support compilation on all these platforms.
-My approach is to collect binaries for these platforms, and put them
-on the master web site (http://www.bzip.org).  Look there.  However
-(FWIW), bzip2-1.0.X is very standard ANSI C and should compile
-unmodified with MS Visual C.  If you have difficulties building, you
-might want to read README.COMPILATION.PROBLEMS.
-
-At least using MS Visual C++ 6, you can build from the unmodified
-sources by issuing, in a command shell: 
-
-   nmake -f makefile.msc
-
-(you may need to first run the MSVC-provided script VCVARS32.BAT
- so as to set up paths to the MSVC tools correctly).
-
-
-VALIDATION
-
-Correct operation, in the sense that a compressed file can always be
-decompressed to reproduce the original, is obviously of paramount
-importance.  To validate bzip2, I used a modified version of Mark
-Nelson's churn program.  Churn is an automated test driver which
-recursively traverses a directory structure, using bzip2 to compress
-and then decompress each file it encounters, and checking that the
-decompressed data is the same as the original.
-
-
-
-Please read and be aware of the following:
-
-WARNING:
-
-   This program and library (attempts to) compress data by 
-   performing several non-trivial transformations on it.  
-   Unless you are 100% familiar with *all* the algorithms 
-   contained herein, and with the consequences of modifying them, 
-   you should NOT meddle with the compression or decompression 
-   machinery.  Incorrect changes can and very likely *will* 
-   lead to disastrous loss of data.
-
-
-DISCLAIMER:
-
-   I TAKE NO RESPONSIBILITY FOR ANY LOSS OF DATA ARISING FROM THE
-   USE OF THIS PROGRAM/LIBRARY, HOWSOEVER CAUSED.
-
-   Every compression of a file implies an assumption that the
-   compressed file can be decompressed to reproduce the original.
-   Great efforts in design, coding and testing have been made to
-   ensure that this program works correctly.  However, the complexity
-   of the algorithms, and, in particular, the presence of various
-   special cases in the code which occur with very low but non-zero
-   probability make it impossible to rule out the possibility of bugs
-   remaining in the program.  DO NOT COMPRESS ANY DATA WITH THIS
-   PROGRAM UNLESS YOU ARE PREPARED TO ACCEPT THE POSSIBILITY, HOWEVER
-   SMALL, THAT THE DATA WILL NOT BE RECOVERABLE.
-
-   That is not to say this program is inherently unreliable.  
-   Indeed, I very much hope the opposite is true.  bzip2/libbzip2 
-   has been carefully constructed and extensively tested.
-
-
-PATENTS:
-
-   To the best of my knowledge, bzip2/libbzip2 does not use any 
-   patented algorithms.  However, I do not have the resources 
-   to carry out a patent search.  Therefore I cannot give any 
-   guarantee of the above statement.
-
-
-
-WHAT'S NEW IN 0.9.0 (as compared to 0.1pl2) ?
-
-   * Approx 10% faster compression, 30% faster decompression
-   * -t (test mode) is a lot quicker
-   * Can decompress concatenated compressed files
-   * Programming interface, so programs can directly read/write .bz2 files
-   * Less restrictive (BSD-style) licensing
-   * Flag handling more compatible with GNU gzip
-   * Much more documentation, i.e., a proper user manual
-   * Hopefully, improved portability (at least of the library)
-
-WHAT'S NEW IN 0.9.5 ?
-
-   * Compression speed is much less sensitive to the input
-     data than in previous versions.  Specifically, the very
-     slow performance caused by repetitive data is fixed.
-   * Many small improvements in file and flag handling.
-   * A Y2K statement.
-
-WHAT'S NEW IN 1.0.0 ?
-
-   See the CHANGES file.
-
-WHAT'S NEW IN 1.0.2 ?
-
-   See the CHANGES file.
-
-WHAT'S NEW IN 1.0.3 ?
-
-   See the CHANGES file.
-
-WHAT'S NEW IN 1.0.4 ?
-
-   See the CHANGES file.
-
-WHAT'S NEW IN 1.0.5 ?
-
-   See the CHANGES file.
-
-WHAT'S NEW IN 1.0.6 ?
-
-   See the CHANGES file.
-
-
-I hope you find bzip2 useful.  Feel free to contact me at
-   jseward@bzip.org
-if you have any suggestions or queries.  Many people mailed me with
-comments, suggestions and patches after the releases of bzip-0.15,
-bzip-0.21, and bzip2 versions 0.1pl2, 0.9.0, 0.9.5, 1.0.0, 1.0.1,
-1.0.2 and 1.0.3, and the changes in bzip2 are largely a result of this
-feedback.  I thank you for your comments.
-
-bzip2's "home" is http://www.bzip.org/
-
-Julian Seward
-jseward@bzip.org
-Cambridge, UK.
-
-18     July 1996 (version 0.15)
-25   August 1996 (version 0.21)
- 7   August 1997 (bzip2, version 0.1)
-29   August 1997 (bzip2, version 0.1pl2)
-23   August 1998 (bzip2, version 0.9.0)
- 8     June 1999 (bzip2, version 0.9.5)
- 4     Sept 1999 (bzip2, version 0.9.5d)
- 5      May 2000 (bzip2, version 1.0pre8)
-30 December 2001 (bzip2, version 1.0.2pre1)
-15 February 2005 (bzip2, version 1.0.3)
-20 December 2006 (bzip2, version 1.0.4)
-10 December 2007 (bzip2, version 1.0.5)
- 6     Sept 2010 (bzip2, version 1.0.6)