modified: checkout.sh to check out upp_gfsv16_release.v1.0.8

   1) Add configuration for Orion.
   2) Make fields at isobaric levels have 41 vertical levels for all forecast hours and analysis in pgrb2 dataset.
   3) Remove SPFH at isobaric levels from pgrb2b dataset.

sorc/checkout.sh

@@ -56,7 +56,7 @@ if [[ ! -d gfs_post.fd ]] ; then
     rm -f ${topdir}/checkout-gfs_post.log
     git clone https://github.com/NOAA-EMC/EMC_post.git gfs_post.fd >> ${topdir}/checkout-gfs_post.log 2>&1
     cd gfs_post.fd
-    git checkout upp_gfsv16_release.v1.0.7
+    git checkout upp_gfsv16_release.v1.0.8
     cd ${topdir}
 else
     echo 'Skip.  Directory gfs_post.fd already exists.'