Comma sep display numbers

[benjeffery]

Fixes #3017

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.84%. Comparing base (dca04b3) to head (fa1a9a4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3018   +/-   ##
=======================================
  Coverage   89.84%   89.84%           
=======================================
  Files          29       29           
  Lines       32097    32097           
  Branches     5756     5756           
=======================================
  Hits        28837    28837           
  Misses       1859     1859           
  Partials     1401     1401           

Flag	Coverage Δ
c-tests	86.69% <ø> (ø)
lwt-tests	80.78% <ø> (ø)
python-c-tests	89.05% <ø> (ø)
python-tests	99.00% <100.00%> (ø)

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Files with missing lines	Coverage Δ
python/tskit/genotypes.py	99.07% <ø> (ø)
python/tskit/tables.py	98.96% <100.00%> (ø)
python/tskit/trees.py	98.80% <ø> (ø)
python/tskit/util.py	99.25% <ø> (ø)

[jeromekelleher]

That was a bigger change than anticipated! LGTM though.

[jeromekelleher]

Definitely worth a changelog entry

[benjeffery]

Changelog added.