missing features in service discovery
According to GajimXEPSupport, gajim implement xep-0085, but it doesn't advertise as such, even if xep mandates the opposite. It also do not advertise Adhoc support ( xep 0050 ), and it doesn't advertise service discovery ( http://jabber.org/protocol/disco#info, as mandated by xep 0030 ). Patch enclosed
More ever, gajim seems to answer to requests using on the "http://jabber.org/protocol/disco" namespace ( in trunk/src/common/connection_handlers.py, search _discoGetCB ), but I didn't found where this should be used or defined, or the difference with "http://jabber.org/protocol/disco#info". The xep 0030 do not speak of it, so I think this is dead code that could be removed. Keeping it only make code more complex.