2004-02-19  Michael Natterer  <mitch@gimp.org>

	* app/config/gimpconfig-serialize.c
	(gimp_config_serialize_property)
	* app/config/gimpconfig-deserialize.c
	(gimp_config_deserialize_property): Reverted my last "cleanup" and
	put the "obsolete" check for the exact owner class of the property
	back. It appears that if a subclass does *not* implement
	GimpConfigInterface *itself*, it still inherits
	serialize_property()/deserialize_property().