Try to use duplicate all of django.contrib.admin using django-admin2 on Example2

- Use example2
- Try to add all functionality from https://docs.djangoproject.com/en/dev/ref/contrib/admin/ but do it using django-admin2
# Document the following:

What django-admin2 does well
Where django-admin2 lacks functionality

Start with example2 and the django.contrib.admin documentation linked in the issue, then exercise the documented functionality using django-admin2. Record which features work and which are missing, and finish with documentation covering both django-admin2's strengths and its gaps.

Written by the indexing model from the issue text.