INST: in installer, check if last character of installation path is /. If not, add it.
INST: in installer, check if last character of installation path is /. If not, add it.

Former-commit-id: 4926a7fe94bd954367479e551260a256f5f968f4 [formerly a2511e53a98284a1ea3e8a76c2e90cc805156392]
Former-commit-id: 6d00586b662d30be4de55a4a6344aefdce0aae89
Former-commit-id: d17602f360e2326d56cffc0ed24e44546e0019b9
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox