* app/Makefile.am: build color_cmds, lut_funcs, and pixel_processor
	* app/app_procs.c: feedback in the splash screen when loading
 	parasites.
	* app/boundary.c: Optimized find_empty_segs.

	* app/brightness_contrast.[ch]
	* app/levels.[ch]
	* app/posterize.[ch]:
 	moved pdb and lut calculation code.  These files now contain only
	GUI functions.

	* app/channel.c: Optimized channel_bounds (fewer compares, better
 	use of registers).  Use color_region instead of channel_*_segment
 	in channel_combine_rect.  Optimized channel_combine_ellipse by
 	skipping pixels inside of the ellipse.  Use
 	pixel_region_process_parallel in channel_combine_mask.  Use a
 	GimpLut in channel_invert, and channel_sharpen.

	* app/invert.c
	* app/equalize.c: moved the lut functions to lut_funcs.c

	* app/gimpdrawable.c, app/gimpdrawableP.h
	* app/gimpimage.c, app/gimpimageP.h: removed unused gimpmatrix
	variables/includes.

	* app/gimplut.[ch]: added new ...