install dir creation is more robust, does not fail in package installation
install dir creation is more robust, does not fail in package installation


Former-commit-id: fa74f181f70c357a2254d083b55ba224ebc0588b [formerly c352ffe31257a91a056a05285b9f951492152d08]
Former-commit-id: aa643f9eafe293b476b59b114558444586dfa152
Former-commit-id: fdd7f0d255db21aab8401a7791e8ace0a49a2095
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox