Use more accurate GRIB2 lat/lon grid in mixed GRIB1/GRIB2 files
Use more accurate GRIB2 lat/lon grid in mixed GRIB1/GRIB2 files

Currently the lat/lon grid of the grib message was used.
Now, if the file containes mixed grib1/grib2 messages, the grid of the first grib2 message is used (for better accuracy)

stcorp/harp,stcorp/harp,stcorp/harp,stcorp/harp,stcorp/harp,stcorp/harp