[libpng16] Bump version to 1.6.19beta01

ANNOUNCE

@@ -1,85 +1,32 @@
-Libpng 1.6.18 - July 23, 2015
+Libpng 1.6.19beta01 - July 24, 2015
 
-This is a public release of libpng, intended for use in production codes.
+This is not intended to be a public release.  It will be replaced
+within a few weeks by a public version or by another test version.
 
 Files available for download:
 
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   libpng-1.6.18.tar.xz (LZMA-compressed, recommended)
-   libpng-1.6.18.tar.gz
+   1.6.19beta01.tar.xz (LZMA-compressed, recommended)
+   1.6.19beta01.tar.gz
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lpng1618.7z  (LZMA-compressed, recommended)
-   lpng1618.zip
+   lp1619b01.7z  (LZMA-compressed, recommended)
+   lp1619b01.zip
 
 Other information:
 
-   libpng-1.6.18-README.txt
-   libpng-1.6.18-LICENSE.txt
-   libpng-1.6.18-*.asc (armored detached GPG signatures)
+   1.6.19beta01-README.txt
+   1.6.19beta01-LICENSE.txt
+   libpng-1.6.19beta01-*.asc (armored detached GPG signatures)
+
+Changes since the last public release (1.6.18):
+
+Version 1.6.19beta01 [July 24, 2015]
 
-Changes since the last public release (1.6.17):
-  Removed PNG_SET_CHUNK_[CACHE|MALLOC]_LIMIT_SUPPORTED macros.  They
-    have been combined with PNG_SET_USER_LIMITS_SUPPORTED (resolves
-    bug report by Andrew Church).
-  Fixed rgb_to_gray checks and added tRNS checks to pngvalid.c.  This
-    fixes some arithmetic errors that caused some tests to fail on
-    some 32-bit platforms (Bug reports by Peter Breitenlohner [i686]
-    and Petr Gajdos [i586]).
-  Suppressed some warnings from the Borland C++ 5.5.1/5.82 compiler
-    (Bug report by Viktor Szaka'ts).
-  Replaced "unexpected" with an integer (0xabadca11) in pngset.c
-    where a long was expected, to avoid a compiler warning when PNG_DEBUG > 1.
-  Added contrib/examples/simpleover.c, to demonstrate how to handle
-    alpha compositing of multiple images, using the "simplified API"
-    and an example PNG generation tool, contrib/examples/genpng.c
-    (John Bowler).
-  PNG_RELEASE_BUILD replaces tests where the code depended on the build base
-    type and can be defined on the command line, allowing testing in beta
-    builds (John Bowler).
-  Avoid Coverity issue 80858 (REVERSE NULL) in pngtest.c
-  Avoid a harmless potential integer overflow in png_XYZ_from_xy() (Bug
-    report from Christopher Ferris).
-  Backport filter selection code from libpng-1.7.0beta51, to combine
-    sub_row, up_row, avg_row, and paeth_row into try_row and tst_row.
-  Changed png_voidcast(), etc., to voidcast(), etc., in contrib/tools/pngfix.c
-    to avoid confusion with the libpng private macros.
-  Fixed old cut&paste bug in the weighted filter selection code in
-    pngwutil.c, introduced in libpng-0.95, March 1997.
-  Removed WRITE_WEIGHTED_FILTERED code, to save a few kbytes of the
-    compiled library size. It never worked properly and as far as we can
-    tell, no one uses it. The png_set_filter_heuristics() and
-    png_set_filter_heuristics_fixed() APIs are retained but deprecated
-    and do nothing.
-  Quieted some Coverity issues in pngfix.c, png-fix-itxt.c, pngvalid.c,
-    pngstest.c, and pngimage.c. Most seem harmless, but png-fix-itxt
-    would only work with iTXt chunks with length 255 or less.
-  Removed non-working progressive reader 'skip' function. This
-    function has apparently never been used. It was implemented
-    to support back-door modification of png_struct in libpng-1.4.x
-    but (because it does nothing and cannot do anything) was apparently
-    never tested (John Bowler).
-  Fixed cexcept.h in which GCC 5 now reports that one of the auto
-    variables in the Try macro needs to be volatile to prevent value
-    being lost over the setjmp (John Bowler).
-  Added #ifdef's to contrib/examples programs so people don't try
-    to compile them without the minimum required support enabled
-    (suggested by Flavio Medeiros).
-  Eliminated the final two Coverity defects (insecure temporary file
-    handling in contrib/libtests/pngstest.c; possible overflow of
-    unsigned char in contrib/tools/png-fix-itxt.c). To use the "secure"
-    file handling, define PNG_USE_MKSTEMP, otherwise "tmpfile()" will
-    be used.
-  Removed some unused WEIGHTED_FILTER macros from pngstruct.h
-  Replaced arbitrary use of 'extern' with #define PNG_LINKAGE_*.  To
-    preserve API compatibility, the new defines all default to "extern"
-    (requested by Jan Nijtmans).
-  Belatedly added Mans Rullgard and James Yu to the list of Contributing
-    Authors.
 
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