* sendmail: allow to attach files to emails
* Fix mixup of model objects and model IDs
* Attach to order-level emails, not only position-level emails
* Give attachments a proper file type
* Add a warning note about higher spam chances
Co-authored-by: Raphael Michel <mail@raphaelmichel.de>
* Allow filtering mass-emails for Checkin Lists
* Allow filtering mass emails for not checked in
* Fix email filtering logic issue
* Use Select2 for checkin lists selection
* sendmail plugin: Make checkin list filtering optional
* Remove unused constant
* Re-size panel to only fit the right column
* Revert incorrect JavaScript change
* Change semantics of not_checked_in
* Introduce a subquery to filter on position properties
* .
* Add a position detail page to the frontend
* Mail templates
* Send mails
* Send reminder email
* Add position support to sendmail plugin
* Add and fix some tests
* Fix failing test on real databases
