New features question attributes for the time_limit feature - disable previous button while timer counts down, 2nd warning message, insert your own countdown text. Also re-ordered display of time limit group in advanced settings.
dev - sorry Carsten, I haven't move the javascript out yet, but I will!

git-svn-id: file:///Users/Shitiz/Downloads/lssvn/source/limesurvey_dev@8467 b72ed6b6-b9f8-46b5-92b4-906544132732