add switch for two different init_grib2 approaches for non-E arakawa grids #241
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My solution for conflicting approaches to deriving the non-E arakawa grids is to include both. wgrib2 and ncep_post (incl. NAM) agree on one definition, which is different from what's in NCEPLIBS-ip currently. With this PR, the user calls
use_ncep_post_arakawa()
(which can be called from C, defined asvoid use_ncep_post_arakawa(void)
and called asuse_ncep_post_arakawa()
) to use the wgrib2/ncep_post derivation. The default behavior is to use the current code, so any users of the current definition should be unaffected. This option is only used when gdtn=32769, and can be re-disabled withunuse_ncep_post_arakawa()
.Fixes #238