Main points added:
- File Attachments (Agreement only for now)
- Logo to Institution
- Extra ContactTypes
- Subtitle for Contact
- Contact can choose subtitle/kind during activation
- RequestContact
    - Including view/form to submit new request for Partners
    - Including processing view/form for the Admins
- More stuff....

Passwords will be hashed with the Argon2 library.
https://docs.djangoproject.com/en/1.10/topics/auth/passwords/#using-argon2-with-django

Also, new passwords will go through 'common-passwords-checks'. This will prevent
access to accounts using one of those common brute force password hackers around,
in case of a breach.

First working, not-tested, version of a multi-journal SciPost.
Will rebuild all views to CBVs to use mixing for the recurring
`journal` context variable.