Added set of set handling (thru concept ISA)

tests/core/test_sheerka.py

@@ -38,12 +38,12 @@ class TestSheerka(TestUsingFileBasedSheerka):
             assert isinstance(sheerka.cache_by_key[key], concept_class)
 
     def test_builtin_concepts_can_be_updated(self):
-        sheerka = self.get_sheerka(False, False)
+        sheerka = self.get_sheerka(use_dict=False, skip_builtins_in_db=False)
         loaded_sheerka = sheerka.get(BuiltinConcepts.SHEERKA)
         loaded_sheerka.metadata.desc = "I have a description"
         sheerka.sdp.modify("Test", sheerka.CONCEPTS_ENTRY, loaded_sheerka.key, loaded_sheerka)
 
-        sheerka = self.get_sheerka(False, False)
+        sheerka = self.get_sheerka(use_dict=False, skip_builtins_in_db=False)
         loaded_sheerka = sheerka.get(BuiltinConcepts.SHEERKA)
 
         assert loaded_sheerka.metadata.desc == "I have a description"
@@ -233,7 +233,7 @@ class TestSheerka(TestUsingFileBasedSheerka):
         assert sheerka.value(concept, reduce_simple_list) == expected
 
     def test_list_of_concept_is_sorted_by_id(self):
-        sheerka = self.get_sheerka(False, False)
+        sheerka = self.get_sheerka(use_dict=False, skip_builtins_in_db=False)
         concepts = sheerka.concepts()
 
         assert concepts[0].id < concepts[-1].id