Refactoring: Moves execution to a separate module.

Created by: stefanoborini

Two refactorings:

• moves the execute_workflow routine in a separate module
• changes the name and parameter ordering of layer execution.

force_bdss/execution.py

@@ -37,12 +37,12 @@ def execute_layer(layer, environment_data_values):
 
     Parameters
     ----------
-    environment_data_values: list
-        A list of data values to submit to the evaluators.
-
     layer: ExecutionLayer
         A list of the models for all the data sources
 
+    environment_data_values: list
+        A list of data values to submit to the evaluators.
+
     NOTE: The above parameter is going to go away as soon as we move
     to unlimited layers and remove the distinction between data sources
     and KPI calculators.