REF: get_centerline: changed display message at the end
REF: get_centerline: changed display message at the end

Former-commit-id: 32592c6a2e6c914549bc6b5c9efa09b6ea659133 [formerly ca5ceb489987a7b42213fe4ec779c3e27a9f8026]
Former-commit-id: 8f277ba2845a2f3ee23f994e0064336fe31f77f9
Former-commit-id: 62693ef6b33a14cdba932f4c6a98acecdc2a3a9b
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox