- nsf.c: * added NsfClassListNoDup() to allow just single inserts * added NsfClassListPrint() for debugging * info heritage returns no duplicates * added prototype for NsfNoCurrentObjectError() * report "no current object" when no object is passed to a method. * code cleanup - extended regression test
-nsf.c: * factor out NsfClassListFind() * let result of "cls info heritage" return per-class mixins as well, otherwise it would be useless, since "cls info superclass -closure" would return the same