Version 0.90		04-01-2013		Initial release
Version 0.91		05-01-2013		Renamed events
									Renamed user_backup to backup_user
									Removed "autoincrement"definition
									Fixed typo while updating (for unix platform)
									Updated install instructions
Version 0.92		06-01-2013		Fixed missing quote in Holiday.php
									Added additional option for absence
									Build in check on valid backup user
Version 0.93		06-01-2013		Used different event in manage_user pages
Version 0.94						Chamged lay-out of form