Read description about 200+ files being committed

I organized my three sets of test cases (class times, prerequisites,
courses to schedule) into No Errors, One Error, and Many Errors to
simplify the printing and organizing we'll be doing later.  So Github is
counting all the tests I removed from their original location as well as
the files that were put into a new directory (from when I moved test
files).

Also, I editted the class times index just a little.  I had apparently
marked a file incorrect that was actually incorrect, as pointed out by
Alla.