plot Michel electrons and muons in plot-energy

This commit is a major update to the plot-energy script. The most significant
changes are:

- new prompt event selection

    We now define prompt events as any event >= 100 nhit which is at least 250
    ms away from the last 100 nhit event.

- add Michel electron event selection.

    Michel electrons are now selected as any event between 800 ns and 20
    microseconds after a muon or prompt event. Additionally they are required
    to be >= 100 nhit and pass an extra set of data cleaning cuts (compared to
    the prompt events).

- add an atmospheric "sideband"

    I also updated the script to plot the energy distribution and particle ID
    for all events that *do* have a neutron follower as a kind of sideband
    which should contain only atmospheric events.

- plot muon energy spectrum and angular distribution

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