Commits on Jan 3, 2022

1. Add an optional cohort block to science experiments …

   Many experiments operate on data with a very long tail, and the most
   frequent part of the distribution can wash out notable results in
   sub-groups.  For example, experiment results derived from the data of
   very large customers often look quite different than the much more
   common results from the small data.  Even the use of percentile metrics
   can't overcome these effects since often the relevant percentiles are
   very high (above 99-percentile).
   
   This adds an optional block to Science::Experiment which should return a
   "cohort" when called.  The cohort is passed the result of the experiment
   so it can determine the cohort from the context data, whether the result
   is a mismatch or any of the observation data.
   
   The determined cohort value is available as `Scientist::Result#cohort`
   and is intended to be used by the user-defined publication mechanism.

   Carl Brasic committed Jan 3, 2022
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