add a function to compute the number of shower photons for muons

Similarly to electrons, I fit an analytic form to the ratio of the number of
photons produced via shower particles over the radiative energy loss. In this
case, I chose the functional form:

    ratio = a*(1-exp(-T/b))

since the ratio seemed to reach a constant value after a certain energy. I then
simulated a 10 GeV muon and it appears that the ratio might actually decrease
after that, so for higher energies I may have to come up with a different fit
function.

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