2001-06-21  Bradford Hovinen  <hovinen@ximian.com>

	* archive.c (archive_set_current_location): Use
	location_get_changed_backends

	* location.c (location_get_changed_backends):
	(location_does_backend_change): Implement
	(create_backends_list):
	(merge_backend_lists): Moved from archive.c

	* gui-backend-list.c (gui_backend_list_launch_current): Use
	location_does_backend_change when deciding whether to pass
	--location on the command line