[SPEC] Customize admin backend and make inlines in all nested objects

Admin panel has all objects as independent forms. Though, some of them are nested with PK and need to be filtered (for example, the MPs of a Career).

This objects need to be nested in the forms using inlines, at least the following ones:

Term > Career > MP > UF
User > Enrolment > Requirements > Uploads (needs rediscussion)
User > Enrolment > UF (needs rediscussion)

You can see an example on how to customize the admin backend for a model and make inlines in the admin.py file in import branch.

[x] Put an inline into Enrolments showing Req_Enrol, and make one of the fields be a marksafe() custom HTML that ouputs the result of querying the Req_Enrol model, thus showing the files associated to Enrolments, via a makeshift "double inline".

AWS2 / djmatrics