NEW: integrity check for the tray matter segmentation
NEW: integrity check for the tray matter segmentation

Former-commit-id: 6193dd399922c461ec99f52e89499ec7ea252d16
Former-commit-id: 3cbb5b28ff13089ba48d9d61d238453f550b51d7
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox