BUG: msct_register: fixed issues with QC output
BUG: msct_register: fixed issues with QC output

Former-commit-id: 3a8676e89bf409860df3f414642389780e5a3ff7 [formerly bbbc76868132a63499269c8fa70cfe11dc801a7d]
Former-commit-id: c90fca80af35e1e9e7b66ab9a64d79e6049508ad
Former-commit-id: 1c1d1222bbcad11865cb03d38897890dcaebea1c
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox