User can now decide to accept or deny a subscription, in
the roster

When we are disconnected from the server and we reconnect,
do not reopen the MUCs in double.

a \n was added when the line was exactly the same width as the
window, so the next nick was one line too low

MessageInput now have a 'draft' option. When you're typing a new message, ↑ and ↓ will keep the unfinished (and unsent) message in the history. fixed #1852