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

Former-commit-id: 4e4127cac919e3e1cfac17960b05d09a685641f7 [formerly c153f2dd1a0f5027e7385849d278b0d41d5c6b29]
Former-commit-id: 7300194ddae28406ba344cc988dbbb0fa13a30ee
Former-commit-id: ffbf18b36fcbaba42cc885d1cce864d94efbb928
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox