Summary
- clarified messages;
- proper message;
- clarified signature;
- clarified modules;
- more robust library_call (again): dynamic file name, static symbol;
- updated to polyml-test-7e49fce62e3d --- follow current ongoing development;
- reintroduced and renamed THF_Predicate_Free deleted by c7e2a9bdc585
- repaired thf output broken by c7e2a9bdc585
- renamed data type
- tuned terminology