Prevents showing an obsolete & confusing delete confirmation screen
on page reload.
Formatted code.
Use PreparePHP_Self() in forms to maintain program state
in Administration.php & Eligibility/Student.php.
Fixed Cancel Delete Event in Calendar.php.
Remove "# Associated" column from Student list in AddStudents.php.
Added DBEscapeIdentifier() where missing.
Aggregated some if conditions to simplify update / remove logic.