Fixing broken migrations

Migrations were inconsistent, this is the correct way to fix them so that the
system can be provisioned from initial empty state.
Adding a django application for local modifications

We should endeavour to keep our changes within it for ease of future
maintenance.
Unique script to normalize combinedopenended scores

Converts a floating set of combinedopenended scores in a given module
to extremes of 0-5. Made to fix Redmine issue 3802.
A script to dump combinedopenended answers to human-readable format

No issue number ot that one.
A script to dump a list of all courses with basic statistics to CSV.

Needs some more work actually, but it was urgent.