Function light_phylogeny::move_species_mappings

pub fn move_species_mappings(
    sp_tree: &mut ArenaTree<String>,
    gene_trees: &mut Vec<ArenaTree<String>>,
    index: usize
)

Move species father when the father and children of a gene speciation are in the same node tree (Only occurs for 3-level gene/symbiot/host reconciliation).