renamed Method.assumption_tac back to Method.assm_tac -- as assumption_tac it would have to be exactly the tactic behind the assumption method (with facts);
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