code: private static void removeOrthologousNodes(Kam kam,
              Map<KamNode, KamNode> ortho) {
          for (KamNode orthoNode : ortho.keySet())
              kam.removeNode(orthoNode);
      }
docs: Remove {@link KamNode orthologous nodes}.
  
  @param kam {@link Kam}
  @param ortho {@link Map} of K: {@link Integer orthologous node id} and
  V: {@link Integer species replacement node id}