Moved all survey database variables into array $thissurvey, and modified related references - including in functions, and global statements. Modified submission statements to check that the PHPSurveyor session variables actually exist before submitting data to responses table.

git-svn-id: file:///Users/Shitiz/Downloads/lssvn/trunk/unstable@1001 b72ed6b6-b9f8-46b5-92b4-906544132732