Mass editing of User attributes

If you have to add/change/remove attributes for a group of users, it can quickly become very time-consuming.

It would be very helpful if you could search for users with certain criteria as you can do with the hosts and then carry out corresponding actions such as "Delete User", "Edit attributes", "Remove explicit attribute settings" for this group of users.

UseCases:
* change Customer
* add/remove Authorised sites
* enable/disable Login
* add/remove roles
* add/remove contact groups
* change Notification settings
* change Personal settings
* change Interface settings