Embed authgroup into group admin.

Mirror authgroup admin permissions from group model.
Delete authgroup permissions.

allianceauth/groupmanagement/models.py

@@ -74,6 +74,7 @@ class AuthGroup(models.Model):
         permissions = (
             ("request_groups", u"Can request non-public groups"),
         )
+        default_permissions = tuple()
 
 
 @receiver(post_save, sender=Group)