Updated StudentControls to use database interface.
These had been stubs before. Note that signatures have now changed for a lot of functions in order to work properly with the database. Also, getCourses (and hence getSessionsNeeded) are not implemented properly as there is no way to do so with current Database interfaces.  Need to get an array of all courses (or all courses for a specific level or degree - though I understand this isn't actually modeled currently).
Merge branch 'master' of https://github.com/nadvamir/GU-PSD3-Team-M