Added getOwner(), required of all objects that go on the security context

stack, to the new DTMLFile.

lib/python/App/special_dtml.py

@@ -155,6 +155,13 @@ class DTMLFile(Bindings, Explicit, HTMLFile):
         apply(DTMLFile.inheritedAttribute('__init__'),
               (self, name, _prefix), kw)
     
+    def getOwner(self, info=0):
+        '''
+        This method is required of all objects that go into
+        the security context stack.
+        '''
+        return None
+
     def _exec(self, bound_data, args, kw):
         # Cook if we haven't already
         self._cook_check()