This patch prohibits changing of agreed_to_tos and agreed_to_tos_on by the Logic module.
This is used so that legally the agreed_to_tos fields can never change in the User model once set.
Patch by: Haoyu Bai
Reviewed by: Lennard de Rijk
A list of bugs is available in the Google App Engine SDK project on Google Code.
The issue tracker is at http://code.google.com/p/googleappengine/issues/.