split mail_delete_odoo_footer in two modules:

* mail_delete_access_link
* mail_delete_sent_by_footer

README.rst

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+Delete access link in email footer
+==================================
+
+Tested on 8.0 ab7b5d7732a7c222a0aea45bd173742acd47242d

__init__.py

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+import mail_delete_access_link

__openerp__.py

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+{
+    'name' : 'Delete access link in email footer',
+    'version' : '1.0.0',
+    'author' : 'Ivan Yelizariev',
+    'category' : 'Social Network',
+    'website' : 'https://yelizariev.github.io',
+    'depends' : ['mail'],
+    'data':[
+        ],
+    'installable': True
+}

mail_delete_access_link.py

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+from openerp.osv import osv
+from openerp import tools, SUPERUSER_ID
+
+class mail_mail(osv.Model):
+    _inherit = 'mail.mail'
+
+    def _get_partner_access_link(self, cr, uid, mail, partner=None, context=None):
+        return None