Since sqlalchemy is providing our database abstraction and we have
moved away from Mongo as the underlying database, it is now time to
simplify things and rip out mongo. This provides the bulk of the
changes, and can stand on its own. There are some followup tasks
that can be done, such as removing now unneeded abstraction layers,
e.g. db.sql.fake.py
* Removed trailing whitespace
* Line length < 80 where possible
* Honor conventions on number of blank lines
* Honor conventions about spaces around :, =
The database is a central point of interest/discussion.
Represent that by its own directory.
This will surely become more interesting when we have
migrations for example.
