File XLOG 2.2 compat

1 Predicate forall/2

2 Predicate call_nth/2

3 Predicate term_singletons/2

4 Predicate ground/1

5 Predicate nonground/2

6 Predicate number_codes/2

7 Predicate term_hash/2

8 Predicate divmod/4

9 Predicate gcd/3

10 Legend