Increase robustness: Wait at least 100 ms between SDM Modbus queries #2184
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The queries to the meters intermittently fail. Some documentation says, 100 ms delay are needed between subsequent requests.
Also adds support for fetching voltage and power factor from SDM120.
get_serialnow declaring to returnOptional[str]to matchAbstractCounterbase class definition. Surely it still always returns the retrieved serial number as string.