Scheduler: overlapping in student agenda toevoeging.
Merge commit '8a462fbd6eec706b59797c7d031b423d8c7ce50f'

Conflicts:
	JavaServer/calzone/src/main/java/com/vub/model/Course.java
	JavaServer/calzone/src/main/java/com/vub/model/Entry.java
	JavaServer/calzone/src/main/java/com/vub/scheduler/SchedularSolver.java
Scheduler: Refactering na aanpassingen DB. Goed restore point voor scheduler.