Store the list of userids for grading in MUC instead of the form data.

Create an assignment and test it thoroughly as a student and as a teacher (create a submission, grade it, lock it, unlock it, try quick grading etc). The navigation between pages has changed so it all needs a good test. Disable javascript and do the same As a teacher disable javascript and click the magnifying glass icon above a students online text submission. Verify the back button on the page works correctly (try this from the grading table and the single grade page). These changes are also covered by unit tests