View all members list. It allows sorting on several columns, and deletion of
selected members. It also handles the search query sent by
?action=admin;area=viewmembers;sa=search.
Called by ?action=admin;area=viewmembers;sa=all or ?action=admin;area=viewmembers;sa=query.
Requires the moderate_forum permission.
uses the view_members sub template of the ManageMembers template.