* 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 function gimp_lut_process_inline
 	that operates on a single PixelRegion.

	* app/gimpparasite.[ch]: new functions to save/load parasiterc

	* app/parasitelist.[ch]: new functions to save/load ParasiteLists
 	in/from files.

	* libgimp/parasite.[ch]: new functions to load/save parasites.

	* app/internal_procs.c: get some procs from new location in
	color_cmds.h.

	* app/pixel_region.[ch]: moved pixel_regions_process_parallel
 	related functions to a new file.

	* app/color_cmds.[ch]: new files for PDB
 	definitions/implementations of color correction functions.

	* app/lut_funcs.[ch]: new files to hold lut creation functions.

	* app/pixel_processor.[ch]: new files that contain the
 	pixel_regions_process_parallel routines.  Added some new
 	capabilities that are currently unused.