Let facstaff control visibility of past student course schedule

[russtuck]

We often hire alumni, and they might feel it's awkward to have their past course schedule shown above their office contact information. As we start to allow more privacy options, it would be good to add a facstaff option to (not) show their schedule of past courses taken as a student. (This may seem a little odd, since alumni schedules are otherwise visible to facstaff, but it would recognize their primary role as an employee.)

This should NOT affect showing past courses taught, since that's public information.

(This of course impacts the API server, too.)