Use unaccent to match makam/form/usul names

Fixes 164
Remove unused tests
Set main instrument of artists so that concert.performers() works
Test commands and rework fixture dumping

No longer dump fixtures to initial_data. We do this for 2 reasons:

- It's annoying always needing to check if data has changed
  before updating a migration
- It's easier to include a specific bit of data in a test without
  loading all modules' initial data before every single testcase