2006-10-20  Michael Natterer  <mitch@gimp.org>

	* app/core/Makefile.am
	* app/core/core-types.h
	* app/core/gimpdrawableundo.[ch]: new undo class for drawable undos.
	This was lurking on my disk too long...

	* app/core/gimpimage-undo-push.c (gimp_image_undo_push_drawable):
	use it instead of implementing it manually.