docs: def prune_to_subset(self, subset, inplace=False):
          """ Prunes the Tree to just the taxon set given in `subset` """
          if not subset.issubset(self.labels):
              print('"subset" is not a subset')
              return
          if not inplace:
              t = self.copy()
          else:
              t = self
          t._tree.retain_taxa_with_labels(subset)
          t._tree.encode_bipartitions()
          t._dirty = True
          return t