* New models
* CRUD UI
* UI for adding/removing team members
* Log display for teams
* Fix invitations, move frontend
* Drop old models (incomplete)
* Drop more old stuff
* Drop even more old stuff
* Fix tests
* Fix permission test
* flake8 fix
* Add tests fore the new code
* Rebase migrations
* [WIP] Failed Payment error handling
When finished, this should fix#248
* rename PaymentFailedException to PaymentException\nimported Exception where neccessary
* comments fixed
* minor style fixes
* Fixed a name error