OPT: label_vertebrae: added -ofolder flag for testing
OPT: label_vertebrae: added -ofolder flag for testing

Former-commit-id: 791bd48b909a08196dcc049cc867bb22a7ada42f [formerly ac5ff3fe1f400df2631daa17483942a1cdf794d4]
Former-commit-id: a8768763024d6af9eb987d87faacf1e64a6a399a
Former-commit-id: fe3d392da2ae79f9095b88cd52400ddb16c268e4
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox