New "hide_tip" question attribute - hides the tip (ie: "Please check all that apply") on a question by question basis. If the attribute exists for a question, then the tip doesn't display.

git-svn-id: file:///Users/Shitiz/Downloads/lssvn/trunk/unstable@1222 b72ed6b6-b9f8-46b5-92b4-906544132732