Merge pull request #357 from wwieder/CTSM_NEON_v4

enable NEON v4 data

adds capability to use NEON v4 data for tower site simulations with CTSM

addresses ESCOMP/CTSM#3594

Dependencies: Also requires ESCOMP/CTSM#3597 for NEON cases to work with this new v4 data.

Answer changes: New datm data are answer changing for NEON cases

Author: billsacks

datm/cime_config/buildnml

@@ -59,7 +59,7 @@ def _get_neon_data_availability(case, neonsite):
     neonatm = None
     dataversion = case.get_value("NEONVERSION")
     if dataversion == "latest":
-        dataversions = ["v3", "v2", "v1"]
+        dataversions = ["v4", "v3", "v2", "v1"]
     else:
         dataversions = [dataversion]