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

tests/parsers/test_SyaNodeParser.py

@@ -968,7 +968,7 @@ class TestSyaNodeParser(TestUsingMemoryBasedSheerka):
     def test_i_can_debug(self, expression, expected_debugs):
         sheerka, context, parser = self.init_parser()
         sheerka.set_debug(context, True)
-        sheerka.debug_var(context, "Sya")
+        sheerka.set_debug_var(context, "Sya")
         res = parser.infix_to_postfix(context, ParserInput(expression))
 
         assert len(res) == len(expected_debugs)
@@ -983,7 +983,7 @@ class TestSyaNodeParser(TestUsingMemoryBasedSheerka):
     def test_i_can_debug_can_pop_using_star(self, settings):
         sheerka, context, parser = self.init_parser()
         sheerka.set_debug(context, True)
-        sheerka.debug_var(context, settings)
+        sheerka.set_debug_var(context, settings)
         res = parser.infix_to_postfix(context, ParserInput("one plus two mult three"))
 
         debug = [str(di) for di in res[0].debug]