add scripts to apply neutrino oscillations to the atmospheric fluxes

This commit adds four scripts:

1. calculate-atmospheric-oscillations

This script uses an independent python package called nucraft to calculate the
neutrino oscillation probabilities for atmospheric neutrinos. These
probabilities are calculated as a function of energy and cosine of the zenith
angle and stored in text files.

2. apply-atmospheric-oscillations

This script combines the high energy 2D atmospheric neutrino flux from Barr and
the low energy 1D flux from Battistoni and then applies neutrino oscillations
to them. The results are then stored in new flux files that can be used with a
modified version of GENIE to simulate the oscillated atmospheric neutrino flux
from 10 MeV to 10 GeV.

3. plot-atmospheric-fluxes

This is a simple script to plot the atmospheric flux files produced by
apply-atmospheric-oscillations.

4. plot-atmospheric-oscillations

This is a simple script to plot the 2D neutrino oscillation probabilities.

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