Fixed #29: Parsers: Implement parsing memoization

Fixed #77 : Parser: ShortTermMemoryParser should be called separately
Fixed #78 : Remove VariableNode usage
Fixed #79 : ConceptManager: Implement compile caching
Fixed #80 : SheerkaExecute : parsers_key is not correctly computed
Fixed #81 : ValidateConceptEvaluator : Validate concept's where and pre clauses right after the parsing
Fixed #82 : SheerkaIsAManager: isa() failed when the set as a body
Fixed #83 : ValidateConceptEvaluator : Support BNF and SYA Concepts
Fixed #84 : ExpressionParser: Implement the parser as a standard parser
Fixed #85 : Services: Give order to services
Fixed #86 : cannot manage smart_get_attr(the short, color)

tests/non_reg/test_sheerka_non_reg2.py

@@ -0,0 +1,18 @@
+from tests.TestUsingMemoryBasedSheerka import TestUsingMemoryBasedSheerka
+
+
+class TestSheerkaNonRegMemory2(TestUsingMemoryBasedSheerka):
+
+    def test_i_can_select_the_correct_concept_when_ambiguity(self):
+        init = [
+            "def concept foo",
+            "def concept x is a y pre is_question() as isa(x,y)",
+            "def concept x is a foo pre is_question() as isinstance(x, foo)",
+        ]
+        sheerka = self.init_scenario(init)
+
+        res = sheerka.evaluate_user_input("question(foo is a foo)")
+
+        # assert len(res) == 1
+        # assert res[0].status
+        # assert res[0].value