Main changes are: - Lemmas for blift and plift are deleted - added split_tac for If (via If2, as If does not begin with a constant) - added new lemmata relating TT, FF and booleans: Def_bool1, Def_bool2, Def_bool3,Def_bool4 They are added to !simpset, but should not cause difficulties - added lemma andalso_or relating | on booleans and andalso on truth values - deleted If_and_if and andalso from !simpset: Pay attention, may kill your proofs! - added adm lemmas for (f x)~=TT and (f x)~=FF.

rename_params_rule used to check if the new name clashed with a free name in the whole goal state. Now checks only the subgoal concerned.