Added consistency checks to modifying answers, deleting answers, modifying question types and deleting questions. Cannot do any of the above if there are associated conditions in existence. User must delete conditions before they can make change.

git-svn-id: file:///Users/Shitiz/Downloads/lssvn/trunk/unstable@336 b72ed6b6-b9f8-46b5-92b4-906544132732