v3.1.1

Bugfixes and improvements:

• Allow general feedback for modeling and text exercises
• Make sure results are shown more consistently in the different pages when navigating forth and back
• Simplify the creation of problem statements for programming exercises by adding a task button and a selection of available test cases
• Add a warning to programming exercises (instructor view) when template and solution code lead to unexpected results. For template code, we expect 0%, for solution code, we expect 100%.
• Restrict some permissions for tutors regarding exercises and participations
• fix overlapping of problem statements with exercise submission in exercise detail page
• Add cancel button for manual text and modeling assessments
• Add possibility to model UML component and UML deployment diagrams