Add support for Meteosat HRIT format
As part of the VOLCAT in NOAA Cloud Project, @scottm has agreed to add support to the Himawari HRIT reader to also support Meteosat HRIT reader (Meteosat HRIT data is the format available in NOAA cloud, not AREA).
The datacenter has provided some sample Meteosat HRIT data: /ships19/grain/msg-example-files.tar.gz
They also provided link to format documentation: https://www.eumetsat.int/media/45126