detectSpikesTetrodes: Detect spikes on the channels of a tetrode.
In kevin-allen/relectro: Analysis of electrophysiological data

This loop for each channel of a tetrode, detect the spikes by calling detectSpikesFromTrace(). The spikes occurring almost simultaneously on different channels are merged with mergeSimultaneousSpikes(). Assumes any low frequency components were filtered out before calling this function.

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detectSpikesTetrodes(data, samplingRate, powerWindowSizeMs, powerWindowSlideMs,
  SDThreshold, simultaneousSpikeMaxJitterMs, spikeDetectionRefractoryMs,
  noDetectionBeginEndMs = 0.5)

`data`	Matrix containing the spikes and some noise, one channel per column
`samplingRate`	Sampling rate of the trace
`powerWindowSizeMs`	Window size when calculating power (root mean square)
`powerWindowSlideMs`	Shift of the window in ms between estimation of power
`SDThreshold`	Power threshold for spike detection.
`simultaneousSpikeMaxJitterMs`	Use to join spikes detected across tetrode as near the same time
`spikeDetectionRefractoryMs`	Refractory period in spike detection on a single channel
`noDetectionBeginEndMs`	Period at beginning and end of trace where nothin is detected because we can't get the waveform