2003-08-27  Michael Natterer  <mitch@gimp.org>

	Enabled type-preserving DND of all kinds of items between
	different images. Fixes bug #119983.

	* app/core/gimpitem.[ch]: added new virtual function
	GimpItem::convert() which duplicates an item for another image.

	* app/core/gimplayer.[ch]: removed gimp_layer_new_from_drawable()
	and made it a GimpItem::convert() implementation.

	* app/vectors/gimpvectors.[ch]: removed gimp_vectors_convert() and
	made it a GimpItem::convert() implementation.

	* app/widgets/gimpitemtreeview.[ch]: removed GimpConvertItemFunc
	typedef and function pointer in GimpItemTreeViewClass since
	we can simply call gimp_item_convert() now.

	* app/widgets/gimplayertreeview.c
	* app/widgets/gimpvectorstreeview.c
	* app/display/gimpdisplayshell-dnd.c
	* tools/pdbgen/pdb/layer.pdb: changed accordingly.

	* app/pdb/layer_cmds.c: regenerated.