While really nearly no modern browser cares about it anymore too much it's still not wrong to have it here (and also stops some automated scanners reporting this...)

Without this patch filtering for the "_everyone" (empty) group did not work for subadmins.

Fixes itself.

* reason: nice to know before password change in user management
* restore is possible:
	* encryption is disabled
	* encryption is enabled, admin and user has checked the
	  restore option
* if not possible:
	* highlight users row in red once the admin wants to change the password
	* show also a little tipsy

Previously when $gid was empty the users were not filtered at all. Rendering the search function in the user management pretty useless.

Fixes itself

* causes the first load after the initial load to hide some users in the viewport
  and showing them again, but with a scrolled up viewport
* causes higher load for nearly never visible effects
* fixes #12962