2004-07-06  Sven Neumann  <sven@gimp.org>

	Added an RGB histogram based on a patch by Tor Lillqvist. Fixes
	bug #145401.

	* app/base/base-enums.[ch]: added GIMP_HISTOGRAM_RGB, don't export
	it to the PDB.

	* app/base/gimphistogram.c: implemented histogram functions for
	the RGB mode.

	* app/base/levels.c
	* app/tools/gimpcurvestool.c
	* app/tools/gimplevelstool.c
	* app/widgets/gimpcolorbar.c
	* app/widgets/gimphistogrameditor.c: handle the new enum value.

	* app/widgets/gimphistogramview.c: for GIMP_HISTOGRAM_RGB mode,
	draw a histogram that shows the RGB channels simultaneously