Updates to datamodel

I updated the models so that the verified date for an identity can be null, to signal that the user has not agreed to the consent yet.

One commit also added more identification types.

I removed the use of the database populater from use in the tests, since the data it output changed when more identification types were updated, so I thought it was a bit too brittle to use there. Not many test were dependent on it, so I just rewrote to use some normal fixtures instead.

I also did not create migrations, but just updated the initial migration since we do not have any data yet and are only two developers working on the project so far.