XMPP accounts

Experimentally, your F-hub.org account is also automatically linked to an XMPP server, with user addresses like username@f-hub.org.  XMPP has advantages over IRC for private group chats and can also federate with other servers, but it is not intended to replace our main IRC service.

In addition, we are also experimenting with a modern XMPP based team-chat client based on the Prose.org software. But it is currently not fully functional yet.