0000655: Editable age group property

Administrators can now change a participant's age group.
Adding missing index to temporary table
0000654: Mechanism to reverse withdrawl when needed

Participant withdraws can now be reversed
only administrators have this functionality
withdraw responses are deleted when a withdraw is reversed
0000663: Add low ed info t othe sample report
Merge remote branch 'origin/release' into develop

Conflicts:
	api/business/survey_manager.class.php
	api/ui/widget/self_assignment.class.php