Merge branch 'update_namelist_wrf_consistency' into release-v4.3 (PR #178)
This merge updates the namelist.wps file for consistency with updates to WRF's
namelist.input (see WRF #1513), and it also makes minor improvements to decrease
user confusion.
- Set interval_seconds to 10800 - namelists are set up specifically for GFS
data, which is usually available every three hours.
- Remove io_form_geogrid and io_form_metgrid variables, as currently we
recommend only setting these to 2, which is the default value.
- Removed old comment regarding using V3.9 settings for geog_data_res.
* update_namelist_wrf_consistency:
Updated namelist.wps for consistency with updates to namelist.input