Remove heavy users

[fbertsch]

Let me know if you see something I missed.

[codecov-io]

Codecov Report

Merging #435 into master will increase coverage by 0.28%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #435      +/-   ##
=========================================
+ Coverage   69.62%   69.9%   +0.28%     
=========================================
  Files          48      45       -3     
  Lines        4141    4007     -134     
  Branches      146     135      -11     
=========================================
- Hits         2883    2801      -82     
+ Misses       1258    1206      -52

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[jklukas]

I just hit "update branch". This should be able to pass tests again with #436 merged.

[mreid-moz]

This looks good to me. It seems a shame to delete the partitioner code, but since it isn't used by anything else, I think it's the right call.

[fbertsch]

@mreid-moz they're in the git log, we can always dust 'em off if we want them.