sometimes not, nor in actions->change topic

if we are windows users and we have GTK/PyGTK 2.10 we now use the GTK api about the status icon (trayicon). I tested under GNU/Linux [at gtk2.10 still is not out for Windows] and all works okay apart from the fact that we cannot do cool tooltips and cannot do animation (which is okay by me). TODO: make usage of basic tooltips [better something than nothing] for this new API

priorities are configurable with autopriority_* ACE options.
Fixes #1999, #1439, #1885, #1076

re draw contact when we open the notif after getting a groupchat invitation from him to remove the message icon in case there is no other event.

get the correct gc_control according to the account when we want to print error message in it. Fixes #2456

Di not ask "are you sure you want to leave room X" when we remove an account. We already replied to "you have opend chat windows". Fixes #2462