perslice working, but txt output is now broken (overwrite)
perslice working, but txt output is now broken (overwrite)


Former-commit-id: 6334cad2df18fe7a2168e3fa5cd3e427583f9d3c
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox