VCF updates

[jeromekelleher]

Missing data in VCF and other tweaks.

[codecov]

Codecov Report

Merging #2329 (f75cc45) into main (2a7341c) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2329   +/-   ##
=======================================
  Coverage   93.29%   93.29%           
=======================================
  Files          28       28           
  Lines       26480    26482    +2     
  Branches     1210     1211    +1     
=======================================
+ Hits        24704    24706    +2     
  Misses       1744     1744           
  Partials       32       32           

Flag	Coverage Δ
c-tests	92.31% <ø> (ø)
lwt-tests	89.05% <ø> (ø)
python-c-tests	71.35% <8.33%> (-0.02%)	⬇️
python-tests	98.86% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
python/tskit/trees.py	98.17% <100.00%> (ø)
python/tskit/vcf.py	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2a7341c...f75cc45. Read the comment docs.

[benjeffery]

LGTM!