* MKBDIGI-183: Added quotas API write methods
* MKBDIGI-183: Fixed code formatting
* MKBDIGI-183: Added test for permission requirements
* MKBDIGI-183: Documentation corrections
* MKBDIGI-183: Removed redundant create/update locks
* MKBDIGI-183: Added quota validation to check that items and variations corresponds to each other
* MKBDIGI-183: Added quota validation to check that item belong to the same event as the endpoint
* MKBDIGI-183: Added subevent validation to check that subevent belong to the same event as the endpoint
* MKBDIGI-183: Added subevent validation to check that subevent is null for non-series events
* MKBDIGI-183: Changed validation error text
* MKBDIGI-183: Added logging for subevents
* MKBDIGI-183: Fixed code formatting
* MKBDIGI-183: Fixed validation error in API test
* MKBDIGI-183: Fixed documentation errors
* MKBDIGI-183: Fixed typos in validation messages
* MKBDIGI-183: Refactored validation loop vars check
* MKBDIGI-183: Updated error strings in test assersions
* MKBDIGI-183: Fixed logging for API quota update to account changing subevents
* New concept for fee handling
* More usages
* Remove all usages, make all tests pass
* API changes
* Small fixes
* Fix order of invoice lines
* Rebase migration
* Data model
* little crud
* SubEventItemForm etc
* Drop SubEventItem.active, quota editor
* Fix failing tests
* First frontend stuff
* Addons form stuff
* Quota calculation
* net price display on EventIndex
* Add tests, solve some bugs
* Correct quota selection in more places, consolidate pricing logic
* Fix failing quota tests
* Fix TypeError
* Add tests for checkout
* Fixed a bug in QuotaForm
* Prevent immutable cart if a quota was removed from an item
* Add tests for pricing
* Handle waiting list
* Filter in check-in list
* Fixed import lost in rebase
* Fix waiting list widget
* Voucher management
* Voucher redemption
* Fix broken tests
* Add subevents to OrderChangeManager
* Create a subevent during event creation
* Fix bulk voucher creation
* Introduce subevent.active
* Copy from for subevents
* Show active in list
* ICal download for subevents
* Check start and end of presale
* Failing tests / show cart logic
* Test
* Rebase migrations
* REST API integration of sub-events
* Integrate quota calculation into the traditional quota form
* Make subevent argument to add_position optional
* Log-display foo
* pretixdroid and subevents
* Filter by subevent
* Add more tests
* Some mor tests
* Rebase fixes
* More tests
* Relative dates
* Restrict selection in relative datetime widgets
* Filter subevent list
* Re-label has_subevents
* Rebase fixes, subevents in calendar view
* Performance and caching issues
* Refactor calendar templates
* Permission tests
* Calendar fixes and month selection
* subevent selection
* Rename subevents to dates
* Add tests for calendar views
