compare indiv table rows and test

[petrelharp]

@mufernando noticed that we can't compare IndividualTableRows because of the numpy arrays. And, it turned out this wasn't being tested anywhere. There is discussion about the right way to do this in attrs, but currently we just have to implement __eq__. The precise way to do this will change soon, but no big deal.

[codecov]

Codecov Report

Merging #582 into master will decrease coverage by 1.18%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master     #582      +/-   ##
==========================================
- Coverage   88.49%   87.30%   -1.19%     
==========================================
  Files          20       21       +1     
  Lines       12170    16508    +4338     
  Branches     2267     3243     +976     
==========================================
+ Hits        10770    14413    +3643     
- Misses        788     1030     +242     
- Partials      612     1065     +453     

Flag	Coverage Δ
#c_tests	88.49% <85.71%> (-0.01%)	⬇️
#python_c_tests	90.39% <85.71%> (?)
#python_tests	99.21% <85.71%> (-0.03%)	⬇️

Impacted Files	Coverage Δ
python/tskit/tables.py	99.64% <85.71%> (-0.18%)	⬇️
python/_tskitmodule.c	83.97% <0.00%> (ø)

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[jeromekelleher]

LGTM, thanks @petrelharp. Not quite up on the subtleties of what's the right approach here, though.

[petrelharp]

Judging from that attrs github issue, I think this is fine.

[petrelharp]

Whoops - I missed some test coverage; now I should have got it?

[petrelharp]

I'll merge when the checks finish unless someone says otherwise.