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This commit adds a new program called zdab-cat which is kind of like fit, but
just produces the YAML output without actually fitting anything.
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This commit adds Rayleigh scattering to the likelihood function. The Rayleigh
scattering lengths come from rsp_rayleigh.dat from SNOMAN which only includes
photons which scattered +/- 10 ns around the prompt peak. The fraction of light
which scatters is treated the same in the likelihood as reflected light, i.e.
it is uniform across all the PMTs in the detector and the time PDF is assumed
to be a constant for a fixed amount of time after the prompt peak.
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This commit also adds a script to calculate the CSDA range for electrons from a
table of the stopping power as a function of energy. We need this script since
the NIST ESTAR website will only output the stopping power above a certain
energy threshold (1 GeV for electrons).
See https://physics.nist.gov/PhysRefData/Star/Text/ESTAR.html.
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