xmpp: Does not prefer contacts over xmpp spam
chatty remember all my 'conversations' even those which are just xmpp spam that sent me a message once. So when i go to
New message... i get a long list of old 'conversation' although i never had a conversation with them and even rejected their authorizeation requests. Since i can't easily delete these conversations on long press this makes chatty hard to use with real live accounts. It would already be a bonus if chatty would highlight 'conversations' with contacts i don't have in my xmpp roaster.