MySAORMProvider working for tables and forms and dropdowns, yeah
Rename and cleanup
Remove old-style filter queries from everywhere
Rename that stuff
Note branch goal in Changelog
First filter by pks in _get_obj

If query_modifier contains joins, the original pks for filtering won't
be effective anymore.
Change query_modifiers key meaning
Permission and code cleanup in lessons admin controller
Hide tutored_lessons in tutor controller - changes are to be made on the lesson itself
Code cleanup in event_admin
Further fixups in the queries for event_admin
Model classes will have public=True by default now
Replace all in_ clauses with corresponding joins
Merge branch 'develop' into feature/filterprovider
Rename btn_* parameters to allow_*
Some differentiated test data for checking filtering
Show Teams selection field on Lesson
Merge branch 'feature/filterprovider' into develop