[png-mng-implement] libpng-1.5.18beta01, 1.6.4beta01, and 1.7.0beta17 are available

[Glenn Randers-P. <gl...@gm...>]

libpng-1.5.18beta01, 1.6.4beta01, and 1.7.0beta17 are available
from ftp://ftp.simplesystems.org/pub/png-group/src
and from
http://libpng.sf.net

Version 1.5.18beta01 [August 21, 2013]
  Delay calling png_init_filter_functions() until a row with nonzero filter
    is found.

Version 1.6.4beta01 [August 21, 2013]
  Added information about png_set_options() to the manual.
  Delay calling png_init_filter_functions() until a row with nonzero filter
    is found.

Version 1.7.0beta17 [August 22, 2013]
  Revised manual about changes in iTXt chunk handling made in libpng-1.6.0.
  Added "/* SAFE */" comments in pngrutil.c and pngrtran.c where warnings
    may be erroneously issued by code-checking applications.
  Added information about png_set_options() to the manual.
  Delay calling png_init_filter_functions() until a row with nonzero filter
    is found.