Sofia-redux

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- Updated FIFI-LS pipeline to v2.8.0, including separate spatial flats for
each dichroic.
- Updated calibration files for HAWC, FORCAST, and EXES for prior cycles with
new analysis from data reprocessing efforts.
- Minor updates for compatibility with third-party dependency changes.
- Update packaging for PEP compliance.

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- Minor bug fixes for EXES edge cases (raster flats with non-standard
overlaps; occasional spurious zero-length orders).
- Updated calibration files for EXES.
- Environment update for astropy management.

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- Minor fixes for the spectral viewer, relating to plotting multiple
spectra with potentially mismatched units.

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- Added EXES support (EXES Redux v3.0.0).
- Updated FORCAST pipeline to v2.7.0 to allow the use of measured
water vapor values in calibration routines.
- Updated FIFI-LS pipeline to v2.7.1, including a bug fix to spectral
maps rotated to align detector orientation.
- Updated HAWC pipeline to v3.2.0, including improved identification and
cleaning for discrepant artifacts in scan maps, caused by detector
level jumps.
- Updated the spectral viewer interface to better control spectra in
multiple files, apertures, and orders.

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- Calibration updates for FORCAST flight series OC9V and HAWC flight
series OC9W.
- Expanded acceptable formats for reference line lists in the spectral
viewer.

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- Updated FORCAST pipeline to v2.6.0, including additional parameters to
allow reduction in detector coordinates and a bug fix for water vapor
optimization in spectroscopy calibration.
- Updated FIFI-LS pipeline to v2.7.0, including improved spatial calibration
and astrometry fixes for the final spectral cube and an experimental
scan reduction improvement for OTF data.
- Updated HAWC pipeline to v3.1.0, including a new parameter for the
scan mapping steps, allowing reduction at alternate grid scales.
- Calibration data updates for FIFI-LS flight series OC9T.
- Added FIFI-LS support to the scan module.
- Added support for more general spectral formats, e.g. text files and simple
FITS files, to the spectral viewer.