AC: Add Unstarted column, reset cached layout if columns change
AC: Add Unstarted column, reset cached layout if columns change

paperlesspost/TrackerTracker,fstehle/TrackerTracker,SpotlightUK/TrackerTracker,SpotlightUK/TrackerTracker,paperlesspost/TrackerTracker,SpotlightUK/TrackerTracker,fstehle/TrackerTracker,paperlesspost/TrackerTracker,fstehle/TrackerTracker,artsy/TrackerTracker