Add BaseOneDSpectrum and split functionality that differs in OneDSpectrum and VRODS when multiple beams are given
Add BaseOneDSpectrum and split functionality that differs in OneDSpectrum and VRODS when multiple beams are given

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