Allow loading just a single scheduling check.

Ideally we would do lots of magic ajax stuff, but this was quicker and easier.
You can go to /manage///scheduling_check_list and click on a check to view just
that one.  Unfortunately the names aren't pretty; I will refactor some stuff to
fix that after scheduling weekend.
Remove questionable line from scheduling check list
Merge pull request #1373 from learning-unlimited/single-scheduling-check

Allow loading just a single scheduling check.