Spike-triggered average

Functions to calculate spike-triggered average and spike-field coherence of analog signals.

spike_triggered_average(signal, spiketrains, ...)	Calculates the spike-triggered averages of analog signals in a time window relative to the spike times of a corresponding spiketrain for multiple signals each.
spike_field_coherence(signal, spiketrain, ...)	Calculates the spike-field coherence between a analog signal(s) and a (binned) spike train.