Fixed #43 : BnfNodeParser: I can recognize when multiple level of ISA

Fixed #44 : BnfNodeParser: I must simplify results when multiple levels of ISA
Fixed #45 : Dynamic variables cannot be parsed at restart
Fixed #46 : Concepts variables values are transformed into list by default
Fixed #47 : SheerkaAdmin. Add min, max, mean time when restoring files

tests/core/test_sheerka.py

@@ -120,6 +120,14 @@ class TestSheerkaUsingMemoryBasedSheerka(TestUsingMemoryBasedSheerka):
         assert new.get_value("a") == 10
         assert new.get_value("b") == "value"
 
+    def test_i_can_instantiate_concepts_when_variables_are_defined_in_constructor(self):
+        sheerka, context, foo = self.init_test().with_concepts(
+            Concept(name="foo", variables=[("x", "default value for x"), ("y", None)]),
+            create_new=True).unpack()
+
+        new = sheerka.new(foo.key)
+        assert new.values() == {"x": NotInit, "y": NotInit}  # default values are not used ?
+
     def test_i_can_instantiate_multiple_when_same_key(self):
         sheerka, context, *concepts = self.init_test().with_concepts(
             Concept("foo", body="foo1"),