Enhancements to jpgraph - now shows bar graphs instead of pie charts …

…for multiple choice type questions. Font can be set in config.php ($jpgraphfont). Added check boxes for determining whether or not to display text based fields. Preliminary work for better summary displays of results for ranking questions (not yet enabled)

git-svn-id: file:///Users/Shitiz/Downloads/lssvn/trunk/unstable@989 b72ed6b6-b9f8-46b5-92b4-906544132732