* and removed in front end

Id was replaced by a composite primary key

fix: #72 contribution rating is done for a group now. feat: first approach of solving the group Tasks (getStudentsInSameGroup works)

#77 create Table for Peer2PeerFeedback
#78 db communication (create new entry)
#79 implement createPeer2PeerFeedback
#80 adjust view for student (givefeedback)

feat: creating Quizzes in the DB possible

feat: db reworked for quizzes.

html mutates to jsp step by step. first step

feat: add update for user database entry

fix: post request works in /calculate and Grades was exchanged by ArrayList(Grading), whoop uhm.. whoop!

The AnnotationController handles the database queries