BUG: msct_register/centermassrot: replaced angle_threshold with pca_eigen_ratio
BUG: msct_register/centermassrot: replaced angle_threshold with pca_eigen_ratio

Former-commit-id: 1e410754ff5005dcfcab1bcdd43c4c9ad0e9ddcf
Former-commit-id: f09d74dc398c6619621063434d3035e50adf04a0
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox