TODO

- flow start options
- flow overview
- introduce migrations
- model docs

- Time mark creation
- Time mark validation

- media

- impersonate
  https://stackoverflow.com/questions/2242909/django-user-impersonation-by-admin

Ideas:

- question bank
  -> localize an elaborate question and all its 'stuff' (JS, media)
- Live feedback box
- Instant flow request
- Instant flow results
- Leave feedback
- time limits, extra time?
- Student tags, adapt homepage

- Flow group ordering, max page count, question/page tags

- Deferred grading (essays etc, per question)

Rejected ideas
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- Minimum visit times
- Live chat via candy?