WIP GRIB2 table3.2 earth radius 6,371,229m

[andrewgryan]

I may need guidance on how to get this across the line, I spotted a minor GRIB shapeOfTheEarth value related to a sphere with radius 6,371,229m which should be value 6 from the following table:

https://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc/grib2_table3-2.shtml

[trexfeathers]

@pp-mo any thoughts?

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