INST: installer: modified runProcess to always output status (even if non zero)
INST: installer: modified runProcess to always output status (even if non zero)

Former-commit-id: b5d032b4a9fb7e2f1663a6f03540270691306acf [formerly 914debeac543432439a7aec173351e09db0a1520]
Former-commit-id: f172a56a9a71f5d7c87fa87a7ad8db68f1abf1aa
Former-commit-id: ad9526490a9652c3ee9bf07efb5a10bf87fcad47
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox