Implement Django QA/QC

[rhodges]

django-moderation is the package we want:

• https://github.com/dominno/django-moderation
• https://django-moderation.readthedocs.io/en/latest/ However, it does not support Django 3.x, and we will be using Django 3.2. If it updates its support, we can include it, starting with this branch: https://github.com/Ecotrust/OH4S_Proteins/tree/iss14_qaqc

If we REALLY want it we can fork, rip out the references to django.utils.six, and try to make the whole thing 3.2 compatible.