Some fixes to the floyd steinberg dithering. The error was added to the neughbour pixels, it is now substracted, the results are much better. However, the palette seems to lack saturated colors (in comparison to the one generated b ygimp, wich gives more dithering, but better overall subjective ressemblance to the 24bit image. Maybe having less dithering is fine for us, as we are in a pixelart painting program afterall...
git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@369 416bcca6-2ee7-4201-b75f-2eb2f807beb1
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