Add merge clause for huwiki

[adamwight]

This patch adds rules to merge human- and auto-labeled data.

It's interesting what must have happened on the master branch: we had no rules for the labeled_revisions files, so I imagine that model training used stale data left in the directory from previous runs. Our makefile generator should make this impossible, by asserting that exactly one method of producing the labeled-revisions files is present.

[adamwight]

n.b., I'm building the models, but this PR can be merged separately from the binaries.

[codecov]

Codecov Report

Merging #153 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #153   +/-   ##
=======================================
  Coverage   20.93%   20.93%           
=======================================
  Files          58       58           
  Lines        1070     1070           
=======================================
  Hits          224      224           
  Misses        846      846

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