Added <filename> argument to logfilesize.
Added <filename> argument to logfilesize.

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