desihub / desisim / 16761737149

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Add DLA+ feature with higher-order Lyman series absorption

- Add --dlaplus command line argument to quickquasars.py
- Implement dlaplus parameter in dla_spec() and insert_dlas() functions
- Add comprehensive atomic data arrays for Lyman series (Ly-alpha through Ly-20)
- Include wavelength range optimization to only calculate relevant lines
- Add continuum absorption approximation for higher-order lines
- Add logging and FITS header comments when dlaplus is enabled
- Maintain backward compatibility with default dlaplus=False

17 of 33 new or added lines in 2 files covered. (51.52%)

4353 of 9825 relevant lines covered (44.31%)

0.44 hits per line