2006-06-16  Michael Natterer  <mitch@gimp.org>

	Allow plug-ins to register in <Layers>, <Channels>, <Vectors> and
	<ColormapEditor>:

	* app/pdb/gimppluginprocedure.c
	(gimp_plug_in_procedure_add_menu_path): added the argument type
	checks for the new locations. Factored out duplicated code.

	* app/menus/menus.c (menus_init): add the "plug-in" action
	group to the resp. UI managers.

	* app/menus/plug-in-menus.c (plug_in_menus_menu_path_added):
	support them here too.

	* app/widgets/gimpimageeditor.[ch]
	* app/widgets/gimpitemtreeview.[ch]: added get_image() functions.

	* app/actions/plug-in-commands.c: added new utility functions
	which collect plug-in arguments from GimpImageEditor and
	GimpItemTreeView widgets.

	* menus/channels-menu.xml
	* menus/colormap-editor-menu.xml
	* menus/layers-menu.xml
	* menus/vectors-menu.xml: added separators.

	* menus/image-menu.xml.in: added a "Colormap" placeholder in
	Colors/Map

	* plug-ins/common...