Gajim ditches RIE iq stanzas.
Bug description
Gajim ditches RIE addition requests whenever they're not enclosed into a message stanza.
As stated into Paragraph 3.1 of the xep ( http://xmpp.org/extensions/xep-0144.html#add ) and also following Paragraph 5 ( http://xmpp.org/extensions/xep-0144.html#stanza ), it MUST support IQ payloads, and SHOULD prefer 'em over message payloads in the case the contact is online.