Finish Colless index

[jeromekelleher]

Finishing touches for Colless index

cc @jeremyguez

[benjeffery]

LGTM! Looks like the compiler isn't happy in 64bit mode though.

[codecov]

Codecov Report

Merging #2344 (3099d09) into main (3e61a10) will decrease coverage by 0.02%.
The diff coverage is 84.90%.

@@            Coverage Diff             @@
##             main    #2344      +/-   ##
==========================================
- Coverage   93.29%   93.27%   -0.03%     
==========================================
  Files          28       28              
  Lines       26730    26768      +38     
  Branches     1222     1217       -5     
==========================================
+ Hits        24939    24969      +30     
- Misses       1758     1766       +8     
  Partials       33       33              

Flag	Coverage Δ
c-tests	92.25% <92.50%> (+<0.01%)	⬆️
lwt-tests	89.05% <ø> (ø)
python-c-tests	71.46% <53.84%> (+0.06%)	⬆️
python-tests	98.84% <100.00%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
c/tskit/core.h	100.00% <ø> (ø)
python/_tskitmodule.c	90.68% <58.33%> (-0.06%)	⬇️
c/tskit/trees.c	95.04% <91.17%> (-0.05%)	⬇️
c/tskit/core.c	97.93% <100.00%> (+0.01%)	⬆️
python/tskit/trees.py	98.27% <100.00%> (-0.02%)	⬇️

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