OPT: if printv is set to 'error', now exit programs automatically
OPT: if printv is set to 'error', now exit programs automatically

Former-commit-id: 3e3f86bf8d553e768d4f952ce8e762aa81020ba8 [formerly b4ab9a00230673a376ccf82aae5a2b25dc1bbbb0]
Former-commit-id: 4ea1bc96cc19007474b0d3cc34a8b96d50d7f6e3
Former-commit-id: edb515a784fd89c821a5d727f053175746309bd3
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox