[libpng16] Calculate our own zlib windowBits when decoding rather than

trusting the CMF bytes in the PNG datastream.
[libpng16] Committed new pnglibconf.dfa and prebuilt.
[libpng16] Imported from libpng-1.6.3beta04.tar
[libpng16] Bump version to 1.6.3beta05
[libpng16] Check for EOF in contrib/pngminus/pnm2png.c (Paul Stewart).

Ignore "#" delimited comments in input file to pnm2png.c.
[libpng16] Added an option to force maximum window size for inflating.

For inflate, reverted previous fixes.
Added fixitxt and pngdeflate to the built programs and removed warnings
from the source code and timepng that are revealed as a result.  Fixed
fixitxt when the chunk length is more than 65535 (untested, no test case).
[libpng16] Check that PNG_MAXIMUM_INFLATE_WINDOW is defined before using it.
Correct dependencies in Makefile.am, correct fix
Missing fix for timepng.c and an erroneous check in pngdeflate.c

Signed-off-by: John Bowler <jbowler@acm.org>
Merge branch 'libpng16' of /home/jbowler/src/libpng/libpng into libpng16
pngdeflate: detect bad libpng versions, fix gnu issues
GNU issues: g++ needs a static_cast, gcc 4.4.7 has a broken warning message
which it is easier to work round than ignore.
pngdeflate currently only works with libpng versions that can be made to
reliably fail when the deflate data contains an out-of-window reference.  This
means only 1.6 and later.

Signed-off-by: John Bowler <jbowler@acm.org>
[libpng16] Detect wrong libpng versions linked to pngdeflate, which currently

    only works with libpng versions that can be made to reliably fail when
    the deflate data contains an out-of-window reference.  This means only
    1.6 and later.
  Fixed gnu issues: g++ needs a static_cast, gcc 4.4.7 has a broken warning
    message which it is easier to work round than ignore.
libpng16] Updated contrib/pngminus/pnm2png.c (Paul Stewart):

Fixed whitespace handling
Added a call to png_set_packing()
Initialize dimension values so if sscanf fails at least we have known
   invalid values.
Merge branch 'libpng16' of /home/jbowler/src/libpng/libpng into libpng16