allow 0 or 1 indexing in yt2world and back.  Clean their docs a little
allow 0 or 1 indexing in yt2world and back.  Clean their docs a little

keflavich/spectral-cube,e-koch/spectral-cube,jzuhone/spectral-cube,radio-astro-tools/spectral-cube,low-sky/spectral-cube