#9 Allow prof/TA to view marked work

[Prof. J C Nash]

Current ETPHP requires you to log in as the student to see
the marked file. It would be helpful to include this in the
view for the prof. as I've needed to look at these from
time
to time. The current setup is VERY inconvenient for this.

Suggest raising priority on this to equal that of editing
assignment settings, as it is one of the "commonly needed"
functions for me at least.