Fixed download filename

[GermanoGuerrini]

For a large number of datasets (mostly from Mercator Ocean), the provided filename starts with a portion of a query string: eg: &service=SST_GLO_SST_L4_REP_OBSERVATIONS_010_011-TDS...

In this case, the file name should be retrieved from the Location header of the redirect response. In the example above, the file name is METOFFICE-GLO-SST-L4-REP-OBS-SST_1638355890887.nc This mechanism is reusable for other cases, but it is not always safe - namely not for Cryosat or other ESA datasets.

[FussyDuck]

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