Sparse matrices and Squangles
Trees with more than 9 taxa will be feasible now, thanks to sparse matrices and signed sums.
Use sparse_flattening
and sparse_subflattening
functions for more than 9 taxa.
Splits are now written as two strings in base (m+n)
separated by |
.
For example, 01234567|89ABCDEF
Squangles are also implemented for the purpose of inferring quartet trees.