- better integration with network reachability callback
- fix crashes (mTunnelClient can no longer be NULL)
- avoid useless operations during transcient states
- clarify source code
- allow the application to set root_ca before the tunnel connection actually starts.
-integration of the chat window in the main window
-change of the contact tab
-change of the appearance of the window call and conference
-chat messages saved during the time of the execution of the software
