Variant site struct

[benjeffery]

Fixes #2161

[benjeffery]

@Mergifyio rebase

[mergify]

rebase

❌ Base branch update has failed

err-code: 2C9DD

[codecov]

Codecov Report

Merging #2162 (7daef06) into main (2983da8) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2162      +/-   ##
==========================================
+ Coverage   93.28%   93.29%   +0.01%     
==========================================
  Files          27       27              
  Lines       25897    25891       -6     
  Branches     1163     1163              
==========================================
- Hits        24157    24154       -3     
+ Misses       1710     1707       -3     
  Partials       30       30              

Flag	Coverage Δ
c-tests	92.19% <100.00%> (+0.02%)	⬆️
lwt-tests	89.05% <ø> (ø)
python-c-tests	72.10% <100.00%> (ø)
python-tests	98.89% <ø> (ø)

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Impacted Files	Coverage Δ
c/tskit/genotypes.c	89.59% <100.00%> (+0.78%)	⬆️
python/_tskitmodule.c	90.95% <100.00%> (ø)

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[jeromekelleher]

Great, that's a definite win, thanks.