Added buttons to class summary table for 'demote' and 'promote' actions (functions not yet written); Added remove_user() function to controllers/listing.py
Moved class organization from db.classes to db.auth_group and db.auth_membership; Class member removal working in class list.
Merge branch 'testing' of github.com:monotasker/paideia into testing
more work on listing/user: modal adding almost working; functions in controller for promotion/demotion working (except needs fixed field name in demotion); also removed redundant 'position' field from db.tags (covered by newer tag_position field).