negbin now works with weights.

[JockLawrie]

negbin with weights is currently broken.
This branch fixes this, so that this works for example: negbin(F, D, args...; wts=wts).
A test case is included.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.04%. Comparing base (e2f6c98) to head (e079c8b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #556      +/-   ##
==========================================
+ Coverage   89.86%   90.04%   +0.17%     
==========================================
  Files           8        8              
  Lines        1125     1125              
==========================================
+ Hits         1011     1013       +2     
+ Misses        114      112       -2     

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[nalimilan]

This PR seems completely broken to me as it didn't pass wts to the second glm call inside the loop. The values in the test are the ones you get without any weights. I have a fix at #622.