update chi2

This commit updates the chi2 analysis with two big changes:

- I now apply the energy bias correction in the likelihood per particle
  and not per fit. So there is no longer an energy bias parameter for
  electron + muon fits, instead we just apply the energy bias correction
  for electrons to the electron and the energy bias correction for muons
  to the muon and then add the two kinetic energies.

- I now apply the energy bias correction terms to the data instead of
  the Monte Carlo. This does introduce an issue with discontinuities in
  the likelihood but it makes everything easier to interpret. The
  discontinuities *should* be correctly taken into account by the MCMC.

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