Added a bit to the morehelp for calc to explain floating point inaccuracies.
Added a bit to the morehelp for calc to explain floating point inaccuracies.

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