Pypeit

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- (Hotfix) Deal with wavecalib crash
- Fix class and version check for DataContainer objects.
- Script to check for calibration files
- No longer require bias frames as default for DEIMOS
- Implement grism19 for NOT/ALFOSC
- Introduced another parameter used to identify box slits, as opposed to
erroneous "slits" found by the edge tracing algorithms. Any slit that
has `minimum_slit_length < length < minimum_slit_length_sci` is
considered a `BOXSLIT`, any slit with `length < minimum_slit_length`
is considered a `SHORTSLIT`; the latter are always ignored.
- Introduced order matching code into EdgeTraceSet.
- This helps fix an issue for GNIRS_10L caused by the orders
shifting.
- Introduces two paramters in `EdgeTraceSetPar` to assist the
matching: `order_match` and `order_offset`
- Echelle spectrographs should now always have `ech_order` defined
in the SlitTraceSet object.
- Removes the need for `Spectrograph.slit2order` and
`Spectrograph.order_vec`. Changes propagated, primarily in
`wavecalib.py`, `autoid.py`, and `reduce.py`.
- Adds in Keck/LRISr with the original detector
- Adds in Keck/LRISb with the FITS format

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- Add median combining code
- Make biasframes median combine by default
- Implemented IFU reduction hooks
- KCWI reduction complete up to spec2D frames
- Implemented new flatfield DataContainer to separate pixelflat and
illumflat

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- Add a script (pypeit_flux_setup) for creating fluxing, coadd1d and
tellfit pypeit files
- Add telluric fitting script, pypeit_tellfit

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- Add illumflat frametype
- Enable dark image subtraction
- Refactor of Calibrations (remove cache, add get_dark)
- Enable calibration-only run
- Clean up flat, bias handling
- Make re-use masters the default mode of run_pypeit
- Require Python 3.7
- Fixed a bug in NIRES order finding.
- Add NOT/ALFOSC
- Fluxing docs
- Fix flexure and heliocentric bugs
- Identify GUI updates

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- Various doc hotfixes
- wavelength algorithm hotfix, such that they must now generate an entry
for every slit, bad or good.

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- Various hot fixes