using comments and Q_() for make disctioning of None and Unknown strings. this breaks strings freeze but I hope it is for the good and I hope it is the last time [sorry ppl]

move var that have nothing to do with GTK to gajim instead of roster or gajim.py: contacts, groups, newly_added, to_be_removed, awaiting_messages (was queues), nicks, allow_notifications, con_types, sleeper_state

we now have Contacts in gc, so we can ask information to everyone (even if we don't have the real jid)