Commits on Sep 13, 2016

1. Skip past points at the same time in derivative call within a merged … …

   …series
   
   The derivative() call would panic if it received two points at the same
   time because it tried to divide by zero. The derivative call now skips
   past these points. To avoid skipping past these points, use `GROUP BY *`
   so that each series is kept separated into their own series.
   
   The difference() call has also been modified to skip past these points.
   Even though difference doesn't divide by the time, difference is
   supposed to perform the same as derivative, but without dividing by the
   time.

   

   jsternberg committed Sep 13, 2016
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