Image.Colortable loses colors
Imported from http://bugzilla.roxen.com/bugzilla/show_bug.cgi?id=1348
Reported by Henrik Wallin, Roxen hedda@roxen.com
The order of elements in an array of colors to Image.Colortable() is important somehow.
/home/hedda/colortablebugg.pike @ Idonex is an exemple program that read the file k.png and generates one correct file 'rätt.gif' and one errorous file 'fel.gif'. The only difference is the order of the elements in the array.