Feature natcpp

[jefferis]

• install from https://github.com/natverse/natcpp
• everything should still work without it natcpp
• also speeds up strahler_order

[jefferis]

Could maybe add an option like nat.usenatcpp so that I could check for equivalence of results during testing.

[codecov[bot]]

Codecov Report

Merging #474 (bb63644) into master (136b055) will increase coverage by 0.10%. The diff coverage is 100.00%.

:exclamation: Current head bb63644 differs from pull request most recent head b1bc1bd. Consider uploading reports for the commit b1bc1bd to get more accurate results

@@            Coverage Diff             @@
##           master     #474      +/-   ##
==========================================
+ Coverage   76.89%   76.99%   +0.10%     
==========================================
  Files          47       47              
  Lines        5856     5873      +17     
==========================================
+ Hits         4503     4522      +19     
+ Misses       1353     1351       -2     

Impacted Files	Coverage Δ
R/neuron.R	83.69% <100.00%> (+0.14%)	:arrow_up:
R/ngraph.R	87.56% <100.00%> (+1.00%)	:arrow_up:
R/seglist.R	95.34% <100.00%> (+0.47%)	:arrow_up:
R/summary.R	91.04% <100.00%> (+0.41%)	:arrow_up:
R/utils.R	41.66% <100.00%> (+11.66%)	:arrow_up:

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