Add two-photon continuum method

[wtbarnes]

Fixes #43

[codecov-commenter]

Codecov Report

Base: 90.17% // Head: 90.87% // Increases project coverage by +0.70% 🎉

Coverage data is based on head (fb6f658) compared to base (40a32ad).
Patch coverage: 66.66% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #217      +/-   ##
==========================================
+ Coverage   90.17%   90.87%   +0.70%     
==========================================
  Files          23       23              
  Lines        1882     1885       +3     
==========================================
+ Hits         1697     1713      +16     
+ Misses        185      172      -13     

Impacted Files	Coverage Δ
fiasco/ions.py	92.73% <66.66%> (-0.20%)	⬇️
fiasco/util/setup_db.py	80.21% <0.00%> (+15.38%)	⬆️

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