Add courses to traject + security update
TeacherUnavailability.java en TeacherLecturePreference.java toevoeging
Merge branch 'master' of https://github.com/CalZoneVUB/CalZone
NW:
Enrolled courses edit
Traject Fully Initialised function
Merge branch 'master' of https://github.com/CalZoneVUB/CalZone into TimFrondEnd
Merge branch 'CalZoneVUB/master'