you developed an impressive piece of software – thanks for your work. My paypal donation should have arrived.
I would appreciate, if you could investigate on how to integrate grb2 support for GRIB files. Most weather services in Europe use this format as it offers higher compression (AFAIK). The required libs can be found on https://confluence.ecmwf.int/display/ECC/Releases
Currently I have to convert GRB2 files to GRB using cdo, a tidysome process.