- finish the big pyxmpp->pyxmpp2 refactorisation
- multi-language text for stanza elements (like message/body,
  presence/status) and error text
- implement SCRAM-SHA-1 and SCRAM-SHA-1-PLUS SASL mechanisms

xmpp-base:
- jabber:server stream support (including diallback)
- TLS: verify othername (SRVName and XmppAddr), probably require ASN.1 decoder

xmpp-im:
- privacy lists

other:
- jabber:iq:version
- jabber:iq:search
