File mtt/lib/examples/Identification/idNonlinearTanks/README from the latest check-in

This is the example from:
@Article{Gaw00c,
  author =       {Peter J Gawthrop},
  title =        {Sensitivity Bond Graphs},
  journal =      JFI,
  year =         {2000}
}


NB Compile with -i euler