CLONE - A teacher can change the order in which assignment submissions are listed

This test requires an assignment with several submissions.

1. Login as a teacher, access the assignment and follow the 'View x submitted assignments' link.
2. Try sorting the submissions by first name by clicking the 'First name' heading.
3. Click the 'First name' heading again and check that the submissions are now sorted in the reverse order.
4. Change the submissions shown per page to 2 and click the 'Save preferences' button.
5. Check that the submissions page now displays only 2 submissions.
6. Try hiding one of the columns by clicking the hide icon next to a particular column heading.