Remove module implementation include database table and hibernate mappings
Remove module administration
Fix variable names, there is no validation anymore
Remove module code from exam
Remove module selection during exam creation
Remove module code from protocol
Allow creation of exams when no module exists as there is no module anymore
Remove dirty module code from OO search
Remove last bits of module related code
Merge: Remove module code; this further shrinks the size of the patch; fixes #26

* issue26:
  Remove last bits of module related code
  Remove dirty module code from OO search
  Allow creation of exams when no module exists as there is no module anymore
  Remove module code from protocol
  Remove module selection during exam creation
  Remove module code from exam
  Remove module administration
  Remove module implementation include database table and hibernate mappings