2004-06-28  Michael Natterer  <mitch@gimp.org>

	Allow all sorts of things to be dropped on or in between the
	items of a GimpContainerTreeView:

	* app/widgets/gimpcontainertreeview.[ch]: added more parameters to
	GimpContainerTreeView::drop_possible() to specify where ecactly
	the drop should take place (between or into items) and to support
	dropping all sorts of things.

	Renamed ::drop() to ::drop_viewable() and added ::drop_color(),
	::drop_files() and ::drop_svg(), which cover all possible drop
	types.

	* app/widgets/gimpcontainertreeview-dnd.[ch]: changed accordingly.
	Dispatch all kinds of drops to the resp. virtual functions.

	* app/widgets/gimpitemtreeview.c: changed accordingly.

	* app/widgets/gimplayertreeview.c: allow to drop URIs, colors
	and patterns to the layers dialog. Fixes bugs #119506 and #139246.