At least the BE and the NL DSMR devices use MBUS.
Therefore we make the MBUS obis reference generic, and convert the V5
telegram to use MBUS values.
Finally set self.maxDiff = None to have a full test output on some
tests.
* issue-51-telegram improved mbus device parsing; refactored TelegramParser.parse to return Telegram object which is backwards compatible with the dict result