Introducing ATOMIC test case

[ihursmas]

This pull request introduces forcing and namelists associated with the ATOMIC field campaign. Specifically:

• Adding DEPHY-format associated case configuration namelist files, which will be named as atomic_[period].nml, into scm/etc/case_config/. There are seven periods in total.
• Adding suite_SCM_GFS_v17_p8_ugwpv1_no_nsst.xml and suite_SCM_RRFS_v1beta_no_nsst.xml into ccpp/suites/. This change allows the ATOMIC test case to be run using the 'sfc_ocean' scheme (instead of 'nsst'), which may work more properly for the oceanic field campaign cases (as suggested by Issue #518).
• Modifying suite_info.py in scm/src/ and rt_test_cases.py in test/ accordingly. These changes enable the CCPP SCM to run the SCM_GFS_v16_no_nsst, SCM_GFS_v17_p8_ugwpv1_no_nsst, and SCM_RRFS_v1beta_no_nsst suites.

[hertneky]

@ihursmas Thanks for the contribution. I will try to get to this within the next week.

[grantfirl]

@ihursmas I've updated the v7.0 release asset for the processed_case_input directory to include your new case files. You can test is by re-running ./contrib/get_all_static_data.sh if you'd like.

[ihursmas]

@grantfirl and @hertneky Thank you for working on this together!

I tried ./contrib/get_all_static_data.sh, which successfully gets the ATOMIC forcing data under processed_cae_input. Not sure if the permission of these file would matter though; other forcing files seem to have 644 (I set the permission of these files to be 755 in /home/I-kuan.Hu/ATOMICforcings/ for better accessibility).

[hertneky]

Note to self: Add to UG

@ihursmas Can you provide bullets on the cases - some info to add to section 7.2 of UG?