BUG: changed the order of concatenation of transformation in straightening. Fixed #418
BUG: changed the order of concatenation of transformation in straightening. Fixed #418

Former-commit-id: 19c704939e35ae585f90f9b1dec22599e7f8de47
Former-commit-id: 0a964662c4013f29f9ab16b9fead8086d212fbd2
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox