INST: install_sct: added echo
INST: install_sct: added echo

Former-commit-id: 395fdbff6741b0e8041ab4334d41a91580df58e4 [formerly a29082890217c6cdeb7d0fbaa6a41d7f7426acea]
Former-commit-id: 10ab467b2fca95e5abb3b14b0af1c8e709376640
Former-commit-id: 619ba5f802f22f4c9a4aee63858fce315d0bb63c
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox