Function light_phylogeny::read_recphyloxml_multi

pub fn read_recphyloxml_multi(
    filename: String, 
    global_pipe: &mut ArenaTree<String>, 
    gene_trees: &mut Vec<ArenaTree<String>>, 
    global_roots: &mut Vec<usize>
)

Read a recphyloxml file and store the species and gene trees into several ArenaTree structures.