Fixed Issue 05639: 1.92 does not highlight unanswered or invalid sub-questions - it just flags the whole question
Dev implemented in EM-based JavaScript: invalid values, as based upon 'preg' regular expressions, dynamically shown with red background

git-svn-id: file:///Users/Shitiz/Downloads/lssvn/source/limesurvey_dev@11958 b72ed6b6-b9f8-46b5-92b4-906544132732