version 0.75
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 - added support for any type of input file [Glenn Randers-Pehrson]
 - fixed palette-(re)scaling bug
 - added -verbose and -quiet options (default now is -quiet)
 - added palette-remapping to minimize size of tRNS chunk
 - made Floyd-Steinberg dithering default
 - changed output naming scheme to -fs8.png and -or8.png (FS or ordered dither)

version 0.7
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 - first public release