OPT: label_utils: added get_parser
OPT: label_utils: added get_parser

Former-commit-id: 9f8540555430bc97170c6afd9dfb686371441359 [formerly a95c310a6549d8ad02e89273f48758171053cf3f]
Former-commit-id: af92b4b179fda08da130b96586d962beb1df6fe0
Former-commit-id: f619ee8a84128ca3aae7c3b501095386e78a7de1
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox