Remove dead tree apis

[jeromekelleher]

🎉

[codecov]

Codecov Report

Merging #1936 (1a4968c) into main (315e47a) will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1936      +/-   ##
==========================================
+ Coverage   93.15%   93.25%   +0.09%     
==========================================
  Files          27       27              
  Lines       25085    25048      -37     
  Branches     1109     1109              
==========================================
- Hits        23369    23358      -11     
+ Misses       1682     1656      -26     
  Partials       34       34              

Flag	Coverage Δ
c-tests	92.39% <100.00%> (+0.19%)	⬆️
lwt-tests	89.14% <ø> (ø)
python-c-tests	68.29% <ø> (ø)
python-tests	98.78% <ø> (ø)

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Impacted Files	Coverage Δ
c/tskit/trees.c	94.97% <100.00%> (+0.79%)	⬆️

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[benjeffery]

LGTM! Good to get rid of the dead wood.