Fixed #125: SheerkaErrorManager

Fixed #135: Change services service priorities
Fixed #136: ErrorManager: Implement recognize_error
Fixed #137: BNFNodeParser : Error when parsing regex with sub parsers
Fixed #138: get_last_errors(): real errors sources are lost
Fixed #139: OneError return value removes the origin of the error
Fixed #140: Concept variables are not correctly handled when parsing sub expression
Fixed #143: Implement has_unknown_concepts()

sheerka_backup/python.sb

@@ -1,6 +1,7 @@
 push_ontology("english")
 def concept x is a string pre is_question() as isinstance(x, str)
-def concept x is a integer pre is_question() as isinstance(x, int)
+def concept x is an integer pre is_question() as isinstance(x, int)
+def concept x is an int 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}'
 def concept sha512 from bnf r'[a-f0-9]{128}'