feat(vsc): New viscosity package for GWF model type

autotest/data/vsc04-laktab/stg-vol-surfarea.dat

@@ -0,0 +1,152 @@
+stage,Volume,Surf Area
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autotest/test_gwf_returncodes.py

@@ -19,7 +19,7 @@
 name = "gwf_ret_codes01"
 base_ws = os.path.join("temp", name)
 if not os.path.isdir(base_ws):
-    os.makedirs(base_ws)
+    os.makedirs(base_ws, exist_ok=True)
 app = "mf6"
 if sys.platform.lower() == "win32":
     app += ".exe"