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/core/sheerka/services/SheerkaAdmin.py

@@ -5,6 +5,7 @@ from os import path
 from core.builtin_concepts_ids import BuiltinConcepts, BuiltinContainers
 from core.builtin_helpers import ensure_concept_or_rule
 from core.concept import Concept
+from core.sheerka.services.SheerkaHistoryManager import SheerkaHistoryManager
 from core.sheerka.services.SheerkaMemory import SheerkaMemory
 from core.sheerka.services.sheerka_service import BaseService
 
@@ -33,6 +34,7 @@ class SheerkaAdmin(BaseService):
         self.sheerka.bind_service_method(self.admin_pop_ontology, True, as_name="pop_ontology")
         self.sheerka.bind_service_method(self.ontologies, False)
         self.sheerka.bind_service_method(self.in_memory, False)
+        self.sheerka.bind_service_method(self.admin_history, False, as_name="history")
 
     def caches_names(self):
         """
@@ -214,3 +216,7 @@ class SheerkaAdmin(BaseService):
             res[k] = obj.obj
 
         return self.sheerka.ret(self.NAME, True, self.sheerka.new(BuiltinConcepts.TO_DICT, body=res))
+
+    def admin_history(self, depth=10, start=0):
+        history = self.sheerka.services[SheerkaHistoryManager.NAME].history(depth, start)
+        return self.sheerka.new(BuiltinConcepts.TO_LIST, body=history)