header/meta BUNIT case consistency: BUNIT should always be capitalized
allow slices (integer views, rather than Slice views) to be created
warn if _meta['BUNIT'] is unparseable and set unit to None
cleanup of debugging and add a warning about REST stuff
(I'm not sure this is supposed to be in the slices branch, but I made
the change and I think it's important)
add support for air wavelengths (1-way, no tests)
fill in missing dict entry
wavelength isn't a type
add warning about air wavelength support
moments need to preserve the spectral units, or everything goes right to
hell
deep changes to how spectral units are tracked and maintained
pix_cen was already accounting for units
Merge pull request #113 from keflavich/slices

Allow integer slices
Merge pull request #117 from keflavich/awav

Air wavelength support
Merge pull request #118 from keflavich/preserve_spectral_unit

Moments need to preserve spectral units
Merge pull request #112 from keflavich/bunit_case

BUNIT should be capitalized everywhere