Ensured whitening filter is odd length
Added utility functions to plot CCGs
Allow specification of time window in initial waveform extraction
Removal of duplicate clusters in initialization
Updated initialization script
Updated ignore file
Got rid of downsampling
Got rid of lowpass filter

The temporal whitening filter will re-amplify the high frequencies, so
no point in applying a lowpass filter first
Improved temporal whitening filter

Now accounting for the fact that the signal is band-limited and don't
amplify the previously filtered-out frequencies
Updated documentation
Bug fix: update of posterior during greedy search
Improved initial sorting

Only those clusters are kept that have their maximum waveform on the
center channel. Groups overlap by N-1.
Also removing duplicate spikes

The spike for cluster with the larger waveform is kept
Improved efficiency of waveform estimation