updated for polyml-5.4.0;
discontinued old-fashioned POLY_HOME via path;
more robust handling of polyml-version, preferably provided by Poly/ML distribution itself;
By chapter:
chapters 1 and 2, maybe 3: Peter White
chapters 6, 7 and 8: David von Oheim
chapter 6, maybe 8: Gerwin Klein
chapters 3, maybe 4: Tanja Vos
chapters 1-3 at least: Stefano Bistarelli