Changed to only message doJoin when the user hasn't been notified of new messages.
Changed to only message doJoin when the user hasn't been notified of new messages.

mazaclub/mazabot-core,raboof/supybot,kblin/supybot-gsoc,haxwithaxe/supybot,mazaclub/mazabot-core,frumiousbandersnatch/supybot-code,buildbot/supybot,ProgVal/Limnoria-test,ProgVal/Limnoria-test,prashantpawar/supybot-rothbot,jeffmahoney/supybot,Ban3/Limnoria,Ban3/Limnoria