Fixed #32 : concept groups are not correctly updated

Fixed #35 : Refactor test helper class (CNC, CC, CIO)
Fixed #36 : Concept values are not used when declared with variable expression
Fixed #37 : Objects in memory lose their values are restart
Fixed #38 : func(a=b, c) (which is not allowed) raise an exception

src/evaluators/PythonEvaluator.py

@@ -13,6 +13,7 @@ from core.rule import Rule
 from core.sheerka.ExecutionContext import ExecutionContext
 from core.sheerka.services.SheerkaMemory import SheerkaMemory
 from core.tokenizer import Token, TokenKind
+from core.var_ref import VariableRef
 from evaluators.BaseEvaluator import OneReturnValueEvaluator
 from parsers.PythonParser import PythonNode
 
@@ -332,6 +333,10 @@ class PythonEvaluator(OneReturnValueEvaluator):
         :param name:
         :return:
         """
+
+        if isinstance(name, VariableRef):
+            return getattr(name.obj, name.prop)
+
         if isinstance(name, Rule):
             return context.sheerka.resolve_rule(context, name)