[ADD] mail: mail_message_subtype: add a hidden field, to hide some subtypes from

the followers widget. This will be used to hide the created
subtype on the task or issues for example, while still available
on the related project. The subtype on the task is necessary
to trigger the various autosubscription and notification mechanisms
but its display on task/issue is not.

bzr revid: tde@openerp.com-20140221102823-ca1bvw3qi9kf61uq

addons/mail/mail_message_subtype.py

@@ -51,8 +51,10 @@ class mail_message_subtype(osv.osv):
         'default': fields.boolean('Default',
             help="Activated by default when subscribing."),
         'sequence': fields.integer('Sequence', help="Used to order subtypes."),
+        'hidden': fields.boolean('Hidden', help="Hide the subtype in the follower options")
     }
     _order = 'sequence'
     _defaults = {
         'default': True,
+        'sequence': 1,
     }