BUG: call concat_data() in command line instead of in python
BUG: call concat_data() in command line instead of in python

Former-commit-id: e361e1891303be9600ee9bc2ab0268e9dfeb6968 [formerly e79ef4745fd8c4b4ca1fc02a41c40e517489a498]
Former-commit-id: 5429f38e044d6bd1fe42b793736d36ebc20847a0
Former-commit-id: 67ccb5ce37240dc04960856bddeaad27a4b9b586
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox