NEW: new way to concatenate data. Related to Issue #746
NEW: new way to concatenate data. Related to Issue #746

Former-commit-id: c153f2dd1a0f5027e7385849d278b0d41d5c6b29
Former-commit-id: 7300194ddae28406ba344cc988dbbb0fa13a30ee
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox