Provide an operable downloader for ECMWF data
Currently the GMS pipeline is strictly limited to acquisition dates between 2014-01-01 and 2017-01-31 because atmospheric correction relies on ECMWF weather data. In order to extend this time window we need an operable downloader for ECMWF data based our previous work:
https://gitext.gfz-potsdam.de/hollstei/ECMWF