This fixes a lot of the issues with the LocalUser changes that were
merged recently. There was a problem where the attributes of LocalUser
were not being eagerly loaded and because the Session was detached an
exception was being raised when they were accessed.
This also fixes some typo's which were introduced.
Finally this adds a temporary fix for a potential SQLAlchemy bug, this
is a bug where doing:
User.query.filter(LocalUser.username == "some_username").first()
does NOT yeild a user with the username "some_username" but all users
on the site. The temp fix is to just query the LocalUser, this should
be resolved when bug is confirmed and fixed upstream.
The code base had many references to User.username and other
specific to LocalUser attributes as that was the way it use to exist.
This updates those to query on the generic User model but filtering
by attributes on the LocalUser.
