OPT: added color option in printv
OPT: added color option in printv

Former-commit-id: 60877a5d2c634384de2e6ca5fd91be31efa0594a
Former-commit-id: e5eb8aa6ac597c858d4fe9930499c1c26e7f3db0
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox