Emitter model "efield_idl1_spice": 'iN' pulse selection variable is not properly set in the simulation even if set in the hdf5 generated data

[aj-nielsen]

In NuRadioMC/simulation/simulation.py, an issue arises specifically with the "efield_idl1_spice" emitter model, where, even if you set the pulse you want to use when you generate data with the iN variable as follows (where nonRandomPulse_number is a variable between 0 and 9):

data_sets["iN"] = nonRandomPulse_number * np.ones(n_events)

...the simulation seems to override the iN input and goes back to randomly picking one of the 10 pulses.

I think this issue is somewhere in lines 835-851 of simulation.py, or otherwise is related to the fact that iN doesn't seem to be passed in as a key to the emitter anywhere even if it's set in the data generation step.

(This is admittedly really niche, and I have a simple hack to get around it for now so it doesn't need a fix urgently. But figured it was worth bringing up anyway, especially since the emitter class is in the main branch now.)