OPT: register_to_template: back to all_labels=1 due to rotation (see #610)
OPT: register_to_template: back to all_labels=1 due to rotation (see #610)

Former-commit-id: 2201b1542501da3353f18b0bd1aa79c12600837b [formerly e35687f7e20ee6d1cf866ff7dad5ffdbdda94703]
Former-commit-id: e3b570b6840dec4fd607bacd7dcff92d40fe3841
Former-commit-id: 63b85a02d22cade3a124d019f3a1d968fe789619
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox