Bugfix: #998700 - Users able to submit two surveys/votes. Added token checking routine to every page presented, to ensure that people can't submit two or more surveys per token by a particular cheating method.

git-svn-id: file:///Users/Shitiz/Downloads/lssvn/trunk/unstable@1109 b72ed6b6-b9f8-46b5-92b4-906544132732