rooting now works for rooted and unrooted trees, and toytree objects have root and unroot functions that return a copy. Also added some query funcs like is_rooted to toytree obj
rooting now works for rooted and unrooted trees, and toytree objects have root and unroot functions that return a copy. Also added some query funcs like is_rooted to toytree obj

eaton-lab/toytree