[LMP BS] CheckModel::RemoveUnscheduled().
[LMP BS] Remove unscheduled.
[LMP BS] Checker now has a parent.
[LMP BS] Actually delete the tab on close.
[LMP BS] Set missing/present count in the model.
[LMP BS] Don't remove no news.
[LMP BS] Color-code the check state instead of removing.
[LMP BS] Hide toggle button after check has been started.
[LMP BS] Tolerate missing artists in setArtistScheduled().
[LMP BS] Support selecting all/none.