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()
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
kodjo