title: How to change to default value of a base field with odoo
body: <p>On the user creation form, we have a default field named "Contact Creation" defined <a href="https://github.com/odoo/odoo/blob/9.0/openerp/addons/base/security/base_security.xml#L58" rel="nofollow">here</a>. The default value is <code>True</code> and I'd like to set as <code>False</code> but I don't know how to do.
  Any idea ?</p>