Nik Everett b98b260048
Merge significant_terms into the terms package (backport of ) ()
This merges the code for the `significant_terms` agg into the package
for the code for the `terms` agg. They are *super* entangled already,
this mostly just admits that to ourselves.

Precondition for the terms work in 
2020-05-13 17:36:21 -04:00
..