Improvements to NNIDist() in light of Fack et al. (2002).
Add NNIDiameter(): approximate diameter of NNI distance.
Remove vignette ‘Interpreting tree distances’: duplicates https://ms609.github.io/TreeDistData/articles/09-expected-similarity.html.
Remove redundant data object oneOverlap.
Fix an issue when installing on R 3.x (require C++11 to ensure declaration of UINT_FAST16_MAX).
Fix memory-handling bug in lapjv().