remove a useless test that introduced a bug: when we restore conversation we are not active tab yet (tab is not drawn yet), but we'll in some ms, so we can safely do systray.remove_jid() as we already removed the events from awaiting_messages

dnspython target returns with dot in the end. catch and fix that; thanks della for helping me and reporting this

check for new version [one of the first thing I did for Gajim :)] is not needed anymore as most distros have us. remove it. this also means we can now update Changelog periodically in svn. YUPPIE!

until we find a way to detect snaps from releases revert a commit I did some weeks ago to assist Yann release .exe faster

 * we now migrate automaticaly at startup in a thread
 * progressDialog now scroll textvew to the end