OPT: adapted load_dictionary for sequential processing
OPT: adapted load_dictionary for sequential processing

Former-commit-id: 53e73eb0676e1bb6cae19051f456a49ec87468df [formerly 4b193cbed3b5b1b7e7a8b0efa073535f3592bff6]
Former-commit-id: 89854a3c7391a28d821ddbc7f2c480a7c43ad108
Former-commit-id: 65d884c71411c8925094d4ba2d9d8c1bec27bc74
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox