Incorporated patch #352: Change survey sent/taken from "Y" to the date

When reviewing the tokens display, the fields telling if the survey request was sent, and the survey taken, display a N or Y. This was changed to be the actual date this event took place. This is giving some siginificant additional information to the survey author.

git-svn-id: file:///Users/Shitiz/Downloads/lssvn/trunk/unstable@1589 b72ed6b6-b9f8-46b5-92b4-906544132732