Create an identifier even for channels that do not specify one in the configuration file. Those will get a NilIdentifier. Needed for MeterRandom.
Fix MeterS0: setting mode to non-periodic (compare commit d5c0a10 on c-version). Change to return just one reading (the impulse) and nothing else. Now compatible to c-version and working again.
Merge branch 'master' of https://github.com/volkszaehler/vzlogger