2004-12-12  Sven Neumann  <sven@gimp.org>

	Applied patch from Adam D. Moss (bug #161113):

	* app/core/gimpimage-convert.c: Use a slower but much nicer
	technique for finding the two best colours to dither between when
	using fixed/positional dither methods.  Makes positional dither
	much less lame.