Naming of run groups for non-CONUS domains

[bokhaeng]

Currently the scripts put out NONRD12 regardless of domain, but it will need to produce the run groups names in table A-1 of the nonpoint/onroad design document according to group and domain

[cseppan]

Commit 5f7d5c4 adds an optional environment variable named RUN_GROUP_SUFFIX, which gets appended to the run group name when creating the output files.

export RUN_GROUP_SUFFIX=9AK

By default, the run group suffix is "12" for nonpt, nonroad, and rwc; and "4" for np_oilgas.

The SOURCE_GROUPS input file needs to be updated to not include the grid cell size in the run group names, i.e. NPHI12 -> NPHI, NONRD12 -> NONRD. I've attached an updated version of the file used for 2014.
hem_aermod_groups_2014_25jan2018.csv.txt