- deleted unneeded function eta_long (now in Pure/pattern.ML
- added HOL.min / HOL.max to allowed consts again
- added final simplification step with presburger_ss to
preprocessor again
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