Create full frame wcs directly from submap wcs
This addresses !125 (closed), but creates the full-frame WCS from the submap WCS.
@dstansby1 I tried to push to your branch on your PR but didn't have permission.
This addresses !125 (closed), but creates the full-frame WCS from the submap WCS.
@dstansby1 I tried to push to your branch on your PR but didn't have permission.