Bug fix:
- resolved interface issues with columns, max columns is bigger now
- the access to the statistics link is now as intended, only the student
itself can access and only if it has an active registration
Added method for looking up user aliasses in other applications.
Bug Fix: When using CAS, redirect to the CAS logout page if the authentication fails
Bug Fix: When redirecting to CAS, properly encode the callback URL
Adding the id of the student and the employee number when a person has that role