Log Message:
Version 1.7.47 (built with libpng-1.5.13 and zlib-1.2.7)
  Do not do the heuristic trials of the first 10 methods when -brute is
    specified, because it did not save time as I hoped.
  Fixed a mistake in 1.7.45 and 1.7.46 that caused the output file to
    not be written.

Version 1.7.46 (built with libpng-1.5.13 and zlib-1.2.7)
  Moved the new level 0 methods to the end of the trial list (methods 137-148)

Version 1.7.45 (built with libpng-1.5.13 and zlib-1.2.7)
  Added method 0 (uncompressed). "-m 0" now simply turns on method 0.
  Added "-try10" option that has the same effect that "-m 0" \ 
previously did,
    namely to try only the first ten methods.
  Inserted new methods 17 through 21 with zlib level 0.
  Do the heuristic trials of the first 10 methods when -brute is specified,
    to get quickly to a small solution, so we can bail out of most of the
    remaining trials early. Previously these 10 methods were skipped during
    a -brute run.
  Removed the "-reduce" line from the help screen when \ 
PNGCRUSH_COUNT_COLORS
    is disabled.