Add support for the three hourly output data for the 19.0 and 19.1 experiments.
The change enables downloading of the three-hourly data from the HYCOM + NCODA Global 1/12 degree Reanalysis. In order to maintain backwards compatibility, this change must be enabled with a new keyword-parameter pair (`three', [true/false]). It defaults to the existing behaviour of only downloading the data at midnight each day.
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