Add and exclude Index instance columns

Exclude inherited columns from the Index models.
Add the label columns to Index instances.

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

mayan/apps/document_indexing/views.py

@@ -278,6 +278,7 @@ class IndexListView(SingleObjectListView):
 
     def get_extra_context(self):
         return {
+            'hide_object': True,
             'hide_links': True,
             'no_results_icon': icon_index,
             'no_results_main_link': link_index_template_create.resolve(