Implemented some enhancement request and fixed some bugs

Fixed #2 : Variables are not recognized when inside a rule token
Fixed #15 : Rule: rete attributes are lost when a new ontology is created
Fixed #14 : ReteNetwork: Format rules must not be added to Rete network
Fixed #16 : DefConcept: Variables are not recognized when they are keyword arguments
Fixed #4 : Comparison are not correctly set when comparison property is a concept
Fixed #14 : Parser: merge FunctionParser.NamesNode and ExpressionParser.NamesNode
Fixed #18 : Parser: Add SourceCodeNode test to UnrecognizedNodeParser
Fixed #20 : At startup Number concept is saved in db a numerous number of time
Fixed #21 : CacheManager: I can remove all elements from a ListIfNeededCache and fill it again
Fixed #22 : CacheManager: I can remove all elements from a SetCache and fill it again
Fixed #23 : HistoryManager: history() no longer works
Fixed #24 : HistoryManager: history() no longer works after creating an exec rule
Fixed #25 : SheerkaMemory: Use MemoryObject instead of sheerka.local
Fixed #26 : Debugger: add the list all available services..
Fixed #27 : CONCEPTS_GRAMMARS_ENTRY does not seems to be in use any more
Fixed #28 : Give order to services

src/parsers/DefConceptParser.py

@@ -211,12 +211,12 @@ class DefConceptParser(BaseCustomGrammarParser):
             return None
 
         source = self.sheerka.services[SheerkaExecute.NAME].get_parser_input(None, tokens[1:])
-        parsed = core.builtin_helpers.parse_unrecognized(self.context,
-                                                         source,
-                                                         parsers="all",
-                                                         who=self.name,
-                                                         prop=keyword,
-                                                         filter_func=core.builtin_helpers.expect_one)
+        parsed = self.sheerka.parse_unrecognized(self.context,
+                                                 source,
+                                                 parsers="all",
+                                                 who=self.name,
+                                                 prop=keyword,
+                                                 filter_func=core.builtin_helpers.expect_one)
 
         if not parsed.status:
             self.add_error(parsed.value)