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_BnfNodeParser.py

@@ -1169,7 +1169,7 @@ class TestBnfNodeParser(TestUsingMemoryBasedSheerka):
         :return:
         """
         sheerka, context, parser = self.init_parser(init_from_sheerka=True)
-        sheerka.concepts_grammars.clear()  # to simulate restart
+        sheerka.clear_bnf_definition()  # to simulate restart
         text = "one thousand"
 
         one = CC("one", body=DoNotResolve("one"))
@@ -1195,7 +1195,7 @@ class TestBnfNodeParser(TestUsingMemoryBasedSheerka):
         :return:
         """
         sheerka, context, parser = self.init_parser(init_from_sheerka=True)
-        sheerka.concepts_grammars.clear()  # to simulate restart
+        sheerka.clear_bnf_definition()  # to simulate restart
         text = "fifty one thousand"
 
         one = CC("one", body=DoNotResolve("one"))
@@ -1233,7 +1233,7 @@ class TestBnfNodeParser(TestUsingMemoryBasedSheerka):
 
     def test_i_can_parse_one_hundred_thousand(self):
         sheerka, context, parser = self.init_parser(init_from_sheerka=True)
-        sheerka.concepts_grammars.clear()  # to simulate restart
+        sheerka.clear_bnf_definition()  # to simulate restart
 
         text = "one hundred thousand"
         res = parser.parse(context, ParserInput(text))
@@ -1244,7 +1244,7 @@ class TestBnfNodeParser(TestUsingMemoryBasedSheerka):
 
     def test_i_can_parse_hundreds_like_expression(self):
         sheerka, context, parser = self.init_parser(init_from_sheerka=True)
-        sheerka.concepts_grammars.clear()
+        sheerka.clear_bnf_definition()  # to simulate restart
 
         text = "three hundred and thirty two"
         three = CC("three", body=DoNotResolve("three"))
@@ -1280,7 +1280,7 @@ class TestBnfNodeParser(TestUsingMemoryBasedSheerka):
 
     def test_i_can_parse_bnf_concept_mixed_with_isa_after_restart(self):
         sheerka, context, parser = self.init_parser(init_from_sheerka=True)
-        sheerka.concepts_grammars.clear()  # simulate restart
+        sheerka.clear_bnf_definition()  # to simulate restart
         for c in cmap.values():
             sheerka.get_by_id(c.id).set_bnf(None)