* 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
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