grib bounded level save bug fix
Separate fill value from checksum
Update test results.
Removed requirement for contiguous bounds in area_weights()
Merge pull request #715 from bblay/gribsavebound

grib bounded level save bug fix
Merge pull request #747 from esc24/area_weight_cont_bounds

Removed requirement for contiguous bounds in area_weights()
Merge pull request #767 from rhattersley/fix-fill-value

Separate fill value from checksum in CML
Switch to biggus for deferred loading.
Update tests.
Update results
Remove obsolete import and stop swapping byte order.