NEW: added landmark-based rotation and translation registration
NEW: added landmark-based rotation and translation registration

Former-commit-id: 1f5764e140925769b26dcee9ddb50a19c91fd403 [formerly 1d4f9ebe8680435570e6c8cb1d914d731c7f698a]
Former-commit-id: 6bd07805e06cc00bb6880f1eff3301b5b3b6f028
Former-commit-id: 30925a1523a7b88efb21abf8ebf29f66e6aff017
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox