BUG: copy using shutil not os
BUG: copy using shutil not os

Former-commit-id: e1990a7b2f571cb700d995251469db554f55a312
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox