Changeset 161ce5f for asadb/groups/models.py

Describe changes made by load_people (ASA-#192)

groups/load_people.py outputs a summary of the changes it made --- the numbers
of people processed, the usernames imported, etc.. However, it doesn't describe
what *specific* changes occurred --- what fields were updated, what account
class new users are in, etc.. This adds that data. In particular, showing the
account classes of freshly created and destroyed users will probably help to
notice any weird bursts of activity.