honor the fact that the new Z3 can generate Isar proofs
honor the fact that the new Z3 can generate Isar proofs

MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle