sort order for Bio::Tree::Node each_Descendent
2005
I've updated the code for Bio::Tree::Node so that each_Descendent can return the nodes in alphabetical order. This is achieved by pasing in the string 'alpha' (for alphabetical) or 'revalpha' (for reverse alphabetical). For internal nodes, they are sorted in order of the min or max (alphabetically) node in the sub-clade.