Handles searching for members from the admin search form

• Can be accessed directly (.../index.php?action=admin;area=search;type=members;search_term=x) or from the search form when you select "Members"
• Loads up ManageMembers.php
• Sets $_REQUEST['sa'] to 'query'
• Sets $_POST['membername'] to the search term
• Calls the ViewMembers() function after loading up the variables
• Mostly just a shortcut to the regular member search function