Improvements needed to instructor's view

[cashaffer]

(Largely copied from OpenDSA content repository, since it really belongs here.)

• Column headers need to be turned to be vertical so that each entry takes less horizontal space.
• The current instructor view shows only points per exercise and the total. There needs to be information about individual modules and individual chapters, somewhat like the student view. At a minimum, we should let instructors see the student view for an individual student. Better would be a way to see the scores for all students for a selected module or chapter. The really ideal situation would be to see summed scores for a selected subset of exercises.