Created new functions, checkmandatory, checkconditionalmandatory referred to by the display scripts (question, group, survey). Also added array handling functions previously in the qanda.php script so that all public scripts could access them.

git-svn-id: file:///Users/Shitiz/Downloads/lssvn/trunk/unstable@996 b72ed6b6-b9f8-46b5-92b4-906544132732