add_trees
Arguments
- phy
a phylo object, multiPhylo object, or list of multiPhylo to be added to the nexml
- nexml
a nexml object to which we should append this phylo. By default, a new nexml object will be created.
- append_to_existing_otus
logical, indicating if we should make a new OTU block (default) or append to the existing one.