Set ncciy year explicitly in namelist

This is a bit of hack so that we don't have to specify non-quoted
special characters for the the ncciy parameter such as the '$' character
for templating. This allows the CABLE driver to be compatible with
namelist files generated by standard Fortran namelist parsing tools such
as f90nml.

Temporarily disable spinup until correctly implemented.

payu/models/__init__.py

@@ -20,7 +20,7 @@
 from payu.models.model import Model
 
 index = {
-    'access':   Access,
+    'access':     Access,
     'access-om2': AccessOm2,
     'access-om3': AccessOm3,
     'cice':       Cice,

payu/models/cable.py

@@ -56,9 +56,14 @@ def set_model_pathnames(self):
     def setup(self):
         super(Cable, self).setup()
 
-        if os.path.exists(self.restart_calendar_path):
-            with open(self.restart_calendar_path, 'r') as restart_file:
-                self.restart_info = yaml.safe_load(restart_file)
+        if not self.prior_restart_path:
+            raise RuntimeError(
+                "Spinup is not yet supported for the CABLE model driver. Please "
+                "specify the `restart` key in config.yaml."
+            )
+
+        with open(self.restart_calendar_path, 'r') as restart_file:
+            self.restart_info = yaml.safe_load(restart_file)
 
         with open(self.cable_nml_path, 'r') as f:
             nml_template = Template(f.read())
@@ -67,10 +72,7 @@ def setup(self):
             nml_template.substitute(self.restart_info)
         )
 
-        if self.prior_restart_path:
-            self.cable_nml['cable']['spinup'] = False
-        else:
-            self.cable_nml['cable']['spinup'] = True
+        self.cable_nml['cable']['ncciy'] = self.restart_info['year']
 
         # Write modified namelist file to work dir
         self.cable_nml.write(