#80 better view for student

...dback/peerfeedback/Controller/PeerFeedbackController.java

...peer2peerfeedback/peerfeedback/View/PeerFeedbackView.java

gemeinsamforschen/src/main/webapp/core/overview-student.js

...samforschen/src/main/webapp/feedback/css/viewfeedback.css

...mforschen/src/main/webapp/feedback/js/givepeerfeedback.js

...mforschen/src/main/webapp/feedback/js/viewpeerfeedback.js

gemeinsamforschen/src/main/webapp/give-feedback.jsp

gemeinsamforschen/src/main/webapp/journal/create-journal.jsp

gemeinsamforschen/src/main/webapp/view-feedback.jsp

...insamforschen/src/scripts/dbschema/updatepeerfeedback.sql