libpng-1.4.3, 1.2.44, and 1.5.0beta31 are available

libpng-1.4.3 and 1.2.44 are available from
ftp://ftp.simplesystems.org/pub/png/src
and from
http://libpng.sf.net

and libpng-1.5.0beta31 is available from
ftp://ftp/simplesystems.org/pub/png-group/src

Changes include

  Added missing quotation marks in the aix block of configure.ac
  The new "vstudio" project was missing from the zip and 7z distributions.
  Rewrote png_process_IDAT_data to consistently treat extra data as warnings
    and handle end conditions more cleanly.
  Removed the now-redundant check for out-of-bounds new_row from example.c
  Changed char *msg to PNG_CONST char *msg in pngrutil.c
  Stop memory leak when reading a malformed sCAL chunk.

Glenn

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