Combine two edge matrices
.CombineResults(x, y, stage).ReplaceResults(old, new, stage)
A single 3D array containing each unique edge matrix from (x and)
y, with a firstHit attribute as documented in MaximizeParsimony().
3D arrays, each slice containing an edge matrix from a tree
of class phylo. x should not contain duplicates.
Integer specifying element of firstHit in which new hits
should be recorded.
old array of edge matrices with firstHit attribute.
new array of edge matrices.