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(none)
Creates groups of users that share common access rights. The
name of the group is the username of the group leader. Each
member of the group inherits the permissions that are
granted to the group leader. That means, if a user fails an
access check, another check is made for the group leader.
A user is removed from all groups the special value ‘none’
is used for groupname. If the second parameter is omitted
all groups the user is in are listed.