Make compute_max_time_step private

Co-authored-by: Xylar Asay-Davis <[email protected]>

Author: cbegeman

docs/developers_guide/ocean/api.md

@@ -74,7 +74,6 @@
 
    forward.Forward
    forward.Forward.compute_cell_count
-   forward.Forward.compute_max_time_step
    forward.Forward.dynamic_model_config
    forward.Forward.setup
 

polaris/tasks/ocean/barotropic_gyre/forward.py

@@ -178,7 +178,7 @@ def dynamic_model_config(self, at_setup):
 
         # check whether viscosity suitable for stability
         stability_parameter_max = 0.6
-        dt_max = self.compute_max_time_step(config)
+        dt_max = self._compute_max_time_step(config)
         nu_max = (
             stability_parameter_max
             * (resolution * 1.0e3) ** 2.0
@@ -274,7 +274,7 @@ def setup(self):
         if model == 'omega':
             self.add_input_file(filename='OmegaMesh.nc', target='init.nc')
 
-    def compute_max_time_step(self, config):
+    def _compute_max_time_step(self, config):
         """
         Compute the approximate maximum time step for stability