tmp (mam): various improvments: - updated behaviour and namespace to new urn:xmpp:mam:1 - fixed use of query_id in MAMQueryRequest/MAMClient - added a couple of assertions/checks - use try/except instead of hasAttribute - do not use generateElementsNamed (use elements method instead) - do not ignore missing elements - queryFields return a data form instead of a raw element - fixed bad use of namespace in several addElement - IMAMResource.onArchiveRequest doesn't have to return a Deferred anymore (but may do) - buildForm use data_form.Field class directly and doesn't use intermediate list anymore - /!\ XEP-0313 plugin is temporarly broken