Remove PreserveGetQuerySet mixin. Update SingleObjectList and

MultipleObjectFormActionView views to use a new get_object_list method.

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

mayan/apps/common/views.py

@@ -177,7 +177,7 @@ class FilterResultListView(SingleObjectListView):
         except KeyError:
             raise Http404(ugettext('Filter not found'))
 
-    def get_queryset(self):
+    def get_object_list(self):
         return self.get_filter().get_queryset(user=self.request.user)