Loads the path as one string relative to the current index.
To use this load function, you must specify the load arguments in the router item as:
$item['load arguments'] = array(
'%map',
'%index',
);
search_menu().
function menu_tail_load($arg, &$map, $index) {
$arg = implode('/', array_slice($map, $index));
$map = array_slice($map, 0, $index);
return $arg;
}