pagination
Term summaries

Term summaries are ready to be reviewed by others.  They're
complicated; probably will need to be changes.

Modified filters to reflect the summaries.

Added a help page related to summaries.

Started transfer credits.
Merge branch 'jay_dev' into dev
Add inheritance hierarchy for courses and xfer courses.

Courses taken at UW and transferred from elsewhere have information in
common.  Put it in a common superclass.
Transfer courses appear to be working!
Modest changes to make it work with the production database.  It probably
won't work now with my local database.
Minor mods to attempt_class
Classify courses in DB and UI.