* src/oddjobd.c(oddjobd_introspect_method): provide a list of objects
    	which have the current object's name as an initial substring and which
    	don't themselves appear to have children.
    * src/oddjobd.c(object_has_method): add a quick check to see if a given
    	object already has a specified interface/method pair.
    * src/oddjobd.c(config_add_introspection_methods): add parent objects
    	for all objects we spot, and add introspection method hooks for them
    	as well.
    * src/oddjobd.c(config_register): fix debug messages so that on startup
    	we see new handler registrations again.