2003-11-13  Michael Natterer  <mitch@gimp.org>

	* app/core/gimpimage-undo-push.c (undo_pop_layer): when trying to
	activate the previously selected layer after a layer removal, also
	look at gimage->layer_stack, just as gimp_image_remove_layer()
	does. Should fix regression from 1.2 when there was no avtive
	layer after certain undo operations. Fixes bug #126781.
	Reordered instructions to match gimp_image_remove_layer().

	* app/tools/gimpbrightnesscontrasttool.c
	* app/tools/gimpcolorbalancetool.c
	* app/tools/gimpcolorizetool.c
	* app/tools/gimpcurvestool.c
	* app/tools/gimphuesaturationtool.c
	* app/tools/gimplevelstool.c
	* app/tools/gimpposterizetool.c
	* app/tools/gimpthresholdtool.c: although the crash triggering bug
	is fixed, the image_map tools should not crash when invoked
	without active drawable: changed all _initialize() functions to
	silently return if there is no active drawable.

	Changed "drawable" to "layer" in all user visible warnings about
	indexed or non-RGB drawables. Cleanup.