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

ne need to duplicate code, show_next_unread in remote_control now does the same thing as click on systray when there is one or more pending event

I am with nick amen and someone says hamen; I do not get highlighted but as is I get * and [] and urgency hint from another place of code I cannot find. what must be done: merge that code with needs_highlight method which should be renamed to needs_visual_notification