OPT: batch_processing: MT is before metrics (dmri/fmri), registration of template to the metrics is corrected according to the automatic WM seg, in mt/, label folder is overwritten to not confuse the user. Fix #548 and # 549
OPT: batch_processing: MT is before metrics (dmri/fmri), registration of template to the metrics is corrected according to the automatic WM seg, in mt/, label folder is overwritten to not confuse the user. Fix #548 and # 549

Former-commit-id: 89f288b4c18bade494b6da307221fa7982d3ed3c
Former-commit-id: b1f3d1590789a4e997539c6bc591b15c7f36d0c5
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox