OPT: label_vertebrae: now outputing verbose=2 pics in ofolder
OPT: label_vertebrae: now outputing verbose=2 pics in ofolder

Former-commit-id: a2925b659fa95866161a750c7eeca51438c51fe1
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox