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Fixes #79. Properly account for timings that begin in the morning and end in the evening by special-casing these rather than treating evening times as morning times. Add assertions and give more detailed error messages.
This causes 15.089 ("W EVE (11-6 PM)") to be parsed correctly (as 11:00 AM to 6:00 PM) but also results in early morning ROTC classes (such as NS.100) throwing errors since we don't support times before 8:00 AM (these classes were previously misidentified as evening classes).
It would also make sense to overhaul the timeslot system so that early morning classes can be supported, but I'll leave that to another pull request.