[Dataset] download additional NPP-ATMS data from EUMETSAT

[shmh40]

Downloading additional data available from EUMETSAT, in addition to the data already downloaded in #76

Files to be download:

MICROWAVE_FCDR_V1.1-20200512_FY3*_2008-2018.tar.gz
MICROWAVE_FCDR_V1.1-20200512_METOPA_2006-2018.tar.gz
MICROWAVE_FCDR_V1.1-20200512_METOPB_2013-2018.tar.gz

This is nearing completion and files are on ATOS at $WEATHERGEN_HOME/metop/