Omicron clustering algorithm in EventTable.cluster() method
Created by: dcorre
In addition to the current EventTable.cluster() algorithm, one can set index='omicron' to perform the clustering similarly as omicron.
Examples --------
As before, to cluster an EventTable (table) whose index is
end_time, window is 0.1, and maximize over snr:
>>> table.cluster('end_time', 'snr', 0.1)
New, To cluster an EventTable (table) with the omicron clustering
algorithm, with a window of 0.1, and maximize over snr:
>>> table.cluster('omicron', 'snr', 0.1)