OPT: msct_parser: now display name of file if it does not exist
OPT: msct_parser: now display name of file if it does not exist

Former-commit-id: 930713f2a488452e3f5aa5728c42dd9237fa7849 [formerly d90f04a718f1d124f9d412a9155ebb76c97ea504]
Former-commit-id: f33e496f74e0723f08d2c601ecd1a739fd167c56
Former-commit-id: 024a91e2fcf04166eeee395acf09711e2be0bb39
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox