Fixed #43 : BnfNodeParser: I can recognize when multiple level of ISA

Fixed #44 : BnfNodeParser: I must simplify results when multiple levels of ISA
Fixed #45 : Dynamic variables cannot be parsed at restart
Fixed #46 : Concepts variables values are transformed into list by default
Fixed #47 : SheerkaAdmin. Add min, max, mean time when restoring files

_concepts_python.txt

@@ -1,5 +1,5 @@
+push_ontology("english")
 def concept x is a string pre is_question() as isinstance(x, str)
-def concept x is a int pre is_question() as isinstance(x, int)
 def concept x is a integer pre is_question() as isinstance(x, int)
 def concept x starts with y pre is_question() where x is a string as x.startswith(y)
 def concept sha256 from bnf r'[a-f0-9]{64}'