//FIXME T.seq(i) -> T.leafname(i)
//FIXME T.get_sequences -> T.leafnames()
void delete_node(SequenceTree& T,const std::string& name)
{
int index = find_index(T.get_sequences(),name);
nodeview n = T.prune_subtree(T.branch(index).reverse());
T.remove_node_from_branch(n);
}