Prefer 'livetime' field from GRL for the total livetime calculation. #217
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In case the 'livetime' field exists in GRL definition, use it to calculate the total livetime. Fall back to 'stop' - 'start' calculation in case it does not exist.
This makes the GRL handling identical to csky: https://github.com/icecube/csky/blob/7bc9169f9df868c4ef8105bc51820c85986f8cec/csky/selections.py#L261-L267
For datasets with 'length' field we define renaming dictionary
in the dataset definition.