tmp (wokkel/rsm): various improvments: - restored original tmp.wokkel.pubsub.PubSubService._toResponse_items - changed arguments order in RSMRequest.__init__ to have most common arguments first - added __str__ methods - better parsing/toElement - better handling of optional elements/attributes (count/index) - _toResponse_items handler RSM set elements without modifying original pubsub _toResponse_items - renamed parse to fromElement for coherency