correct more acyclic_term/1 issues (#2111, #2114), add acyclic_term tests

tests/scryer/src_tests.rs

@@ -102,3 +102,12 @@ fn term_variables_tests() {
         "All tests passed",
     );
 }
+
+#[test]
+fn acyclic_term_tests() {
+    run_top_level_test_with_args(
+        &["src/tests/acyclic_term.pl", "-f", "-g", "main_quiet"],
+        "",
+        "All tests passed",
+    );
+}