2003-03-19  Michael Natterer  <mitch@gimp.org>

	* app/widgets/gimpcellrenderertoggle.[ch]
	* app/widgets/gimpcellrendererviewable.[ch]: added public
	functions to emit the "clicked" signal.

	* app/widgets/gimpcontainertreeview.c: use them instead of
	g_signal_emit_by_name().

	* app/widgets/Makefile.am
	* app/widgets/gimpcontainertreeview-dnd.[ch]: new files
	implementing DND for tree views.

	* app/widgets/gimpcontainertreeview.[ch]: added virtual
	functions drop_possible() and drop().

	* app/widgets/gimpitemtreeview.c
	* app/widgets/gimplayertreeview.c: implement drop_possible()
	and drop().