Fixed #131 : Implement ExprToConditions

Fixed #130 : ArithmeticOperatorParser
Fixed #129 : python_wrapper : create_namespace
Fixed #128 : ExpressionParser: Cannot parse func(x) infixed concept 'xxx'

tests/core/test_SheerkaRuleManager.py

@@ -170,7 +170,6 @@ class TestSheerkaRuleManager(TestUsingMemoryBasedSheerka):
         rule = service.init_rule(context, rule)
 
         assert len(rule.error_sink["when"]) > 0
-        assert sheerka.has_error(context, rule.error_sink["when"][0])
         assert "print" not in rule.error_sink
         assert "then" not in rule.error_sink
         assert rule.metadata.is_compiled
@@ -362,7 +361,7 @@ class TestSheerkaRuleManager(TestUsingMemoryBasedSheerka):
             Concept("greetings", definition="hello a", definition_type=DEFINITION_TYPE_DEF).def_var("a"),
             Concept("foo"),
         ).unpack()
-        parser = ExpressionParser()
+        parser = ExpressionParser(old_style=True)
         expected_conditions = get_rete_conditions(*expected)
 
         error_sink = ErrorSink()