implementing groupTasks for dossiers done

...src/main/java/unipotsdam/gf/interfaces/IGroupFinding.java

...s/assessment/controller/model/ContributionCategories.java

...modules/assessment/controller/service/PeerAssessment.java

...tsdam/gf/modules/assessment/controller/view/QuizView.java

...n/src/main/java/unipotsdam/gf/modules/group/GroupDAO.java

.../src/main/java/unipotsdam/gf/modules/group/GroupView.java

...in/java/unipotsdam/gf/modules/group/GroupfindingImpl.java

...f/modules/submission/controller/SubmissionController.java

...potsdam/gf/modules/submission/view/SubmissionService.java

...schen/src/main/webapp/annotation/js/unstructuredUpload.js

gemeinsamforschen/src/main/webapp/taglibs/js/utility.js

gemeinsamforschen/src/test/resources/database/fltrail.sql