add ability to specify a particle combo on the command line

This commit updates the fit program to accept a particle combo from the command
line so you can fit for a single particle combination hypothesis. For example
running:

    $ ./fit ~/zdabs/mu_minus_700_1000.hdf5 -p 2020

would just fit for the 2 electron hypothesis.

The reason for adding this ability is that my grid jobs were getting evicted
when fitting muons in run 10,000 since it takes 10s of hours to fit for all the
particle hypothesis. With this change, and a small update to the
submit-grid-jobs script we now submit a single grid job per particle
combination hypothesis which should make each grid job run approximately 4
times faster.

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