Workflow.py: add universal methods.

product/ERP5Workflow/Document/Workflow.py

@@ -514,6 +514,17 @@ class Workflow(IdAsReferenceMixin("workflow_", "prefix"), XMLObject):
       else:
           return state
 
+  def getVariableList(self):
+    return self.objectValues(portal_type="Variable")
+
+  def getStateList(self):
+    return self.objectValues(portal_type="State")
+
+  def getWorkflowList(self):
+    return self.objectValues(portal_type="Worklist")
+
+  def getTransitionList(self):
+    return self.objectValues(portal_type="Transition")
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