Removed threads and mutexes in connection.py
and gajim.py.
Add resolver through nslookup command, removed
dnspython and pydns (for now).

and it sucks losing a well thought out message.

introducing history_manager.py; button do not work and yes I plan to allow multiple selection of messages

when we remove a contact that has subcontacts or is a subcontact, update meta contacts info stored on the server