frontend improved to take into account new SàT features - quick_frontend: better use of contact management, it now manages nicks, avatars, and connected status - quick_frontend: disconnect and remove are now 2 separate methods for contact list - wix: new contact list using HTML items, and showing avatars. Groups are not showed for now - wix: contact status now use tuples, to keep order, human readable status and color of contact - wix: contact list is updated when avatar or nick is found - wix: fixed 'question' dialog, which is renamed in 'yes/no' - wix: action result are now ignored for unkwnown id - sortilege refactored to work again