Most of the configuration was setup to allow S2SA, but there was no
appropriate nems.configure template. A new one was created by
starting with the S2SWA template and removing the wave portions.

Also added two UFSDA scripts that were missing from the git ignore
list.

Fixes NOAA-EMC#1592

The experiment setup documentation for cycled mode had not been
updated as coupled capability was added. Also added notes to both
the cycled and forecast-only section that ATMW is currently not
working.

setup_expt would only detect two of the possible S2S options when
staging cycled ICs.

Refs: NOAA-EMC#1592

The volcanic aerosol data was moved to a new location within the
GOCART emissions directory.

Refs: NOAA-EMC#1592

The enkf versions of coupled settings (DO_OCN, etc.) do not work
properly because some settings have already been determined by that
point based on the non-enkf versions of the settings. The enkf
versions are now disabled until there is a solution (see NOAA-EMC#1692).

Refs: NOAA-EMC#1593
Refs: NOAA-EMC#1692

The task list for the free-forecast was checking against a list of
apps that did not include S2SA to determine whether ocnpost is
included. That check is now changed to check on do_ocean rather than
looking at the app directly.

Refs: NOAA-EMC#1593

A couple of scripts that had been added to the git ignore list during
the course of this update have since been removed and no longer need
to be ignored.