Sort weighted trees with SortTree()

[ms609]

More progress towards #49

[codecov]

Codecov Report

Merging #106 (8eb2e13) into master (84f85b3) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #106   +/-   ##
=======================================
  Coverage   97.03%   97.04%           
=======================================
  Files          45       45           
  Lines        3744     3752    +8     
=======================================
+ Hits         3633     3641    +8     
  Misses        111      111           

Impacted Files	Coverage Δ
R/tree_display.R	100.00% <100.00%> (ø)
inst/include/TreeTools/renumber_tree.h	98.31% <100.00%> (+0.02%)	⬆️
src/keep_tip.cpp	100.00% <0.00%> (ø)

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