Code style cleanups

Add keyword arguments. Sort arguments and models.
Move literals to their own module. Prepend handler_ to
signal handlers.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/document_indexing/api_views.py

@@ -66,8 +66,9 @@ class APIIndexNodeInstanceDocumentListView(generics.ListAPIView):
             klass=IndexInstanceNode, pk=self.kwargs['pk']
         )
         AccessControlList.objects.check_access(
+            obj=index_node_instance.index,
             permissions=permission_document_indexing_view,
-            user=self.request.user, obj=index_node_instance.index
+            user=self.request.user
         )
 
         return index_node_instance.documents.all()
@@ -112,8 +113,8 @@ class APIDocumentIndexListView(generics.ListAPIView):
     def get_queryset(self):
         document = get_object_or_404(klass=Document, pk=self.kwargs['pk'])
         AccessControlList.objects.check_access(
-            permissions=permission_document_view, user=self.request.user,
-            obj=document
+            obj=document, permissions=permission_document_view,
+            user=self.request.user
         )
 
         return document.index_instance_nodes.all()