OPT: denoise using dipy nlmeans
OPT: denoise using dipy nlmeans

Former-commit-id: d932cab7165bee19053f09327b75b73f7a5f003a [formerly b870dfbc8bf311e272e1e887da5cfd72fd6393fd]
Former-commit-id: 838647f56777170c3e405aa013617e39c0fba359
Former-commit-id: 126459e995d9420d5f3a70899298ba046dd5a7e2
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox