DEV: Post processing: during prediction + fill z_holes
DEV: Post processing: during prediction + fill z_holes

Former-commit-id: c5828e364e84e1eb65559d1848d9b3bd21ccffa3
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox