continued work on casa_beams tests.  Current tests are failing with `ia.fromfits`, which has never been a problem before.
continued work on casa_beams tests.  Current tests are failing with
`ia.fromfits`, which has never been a problem before.

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