better support for nicknames with my icq transport ;-)
this is the first time i try to hack something into gajim,so i don't my patch to work well,but perhaps to be something one can work with. it only works on some vcard stuff my icq transport (i think pyicqt 0.8) sends, and ignores things like XEP-0172 (but the xep says vcard's nickname is one aequivalent definition of nick), so it's really a dirty hack.