Django had a few warnings about code deprecations and recommendations,

which it would show every time the dev server loaded, or when running

other certain management commands.
This change satisfies all warnings (aside from one category, which is

silenced). This just consists of removing null=True from

ManyToManyFields (which doesn't do anything), and fully removing the

legacy settings.TEMPLATE_* settings in favor of settings.TEMPLATES,
The silenced warning is just a suggestion to change a ForeignKey with

unique=True to a OneToOneField. This makes sense, but would require

new work in Django Evolution to understand the equivalency of this

change, and is not worth the time. So instead, we're just telling Django

to ignore this warning.

Ran some standard tests in Review Board. Didn't see any issues, or any

warnings.
Unit tests pass.