adding genuine flag to predicate_compile_quickcheck and prolog_quickcheck (cf. 5e46c225370e);
adjusting smart quickcheck compilation to new signature of exhaustive generators (cf. 1f5fc44254d7);
Gate = FOL +
consts nand,xor :: "[o,o] => o"
rules nand_def "nand(P,Q) == ~(P & Q)"
xor_def "xor(P,Q) == P & ~Q | ~P & Q"
end