Revert "wp++"

This reverts commit 89fcc36fb1.

wp-admin/network/edit.php

@@ -10,6 +10,9 @@
 /** Load WordPress Administration Bootstrap */
 require_once( dirname( __FILE__ ) . '/admin.php' );
 
+if ( ! is_multisite() )
+	wp_die( __( 'Multisite support is not enabled.' ) );
+
 if ( empty( $_GET['action'] ) ) {
 	wp_redirect( network_admin_url() );
 	exit;