Add staff, reviewer and applicant group name to user name display on submission comments to start with.

* Add PAF model and link to funds and labs

* Integrate the extra fields for the PAF into the PAF form

* Update tests to work with the new PAF field

Fixes some larger issues around how data is serialized and deserialized from the
db by the submissions class.

* fixup! Update tests to work with the new PAF field

Change is related to how Django handles the error of the namespacing of the
URLs, in Django 2.0 it failed silently, on 2.1 it fails loudly. Including the
URL conf fixes this.

There are some fixes to the existing tests which were noticed to be wrong when
debugging

We pull submissions from the QuerySet further down, this imposes a fixed
order on that QuerySet in an effort to stabilise the asserts further
down.

* Create a project on accepted determination
* Only create projects when submission is in the final stage
* Wrap determination creation in a transaction
Various parts of setting a determination can fail so lets tie them all
together into a transaction and only send a message when they're all
done successfully.

Ref #1343