Add graphs to graphs menu page.

Use rrd_name() function
Add copyright headers

html/includes/graphs/application/rrdcached.inc.php

@@ -1,5 +1,29 @@
 <?php
-$rrd = $config['rrd_dir'].'/'.$device['hostname'].'/app-rrdcached-'.$app['app_id'].'.rrd';
+/**
+ * rrdcached.inc.php
+ *
+ * Generate the rrd file and verify it is valid
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @package    LibreNMS
+ * @link       http://librenms.org
+ * @copyright  2016 Tony Murray
+ * @author     Tony Murray <murraytony@gmail.com>
+ */
+
+$rrd = rrd_name($device['hostname'], array('app', 'rrdcached', $app['app_id']));
 if (is_file($rrd)) {
     $rrd_filename = $rrd;
 }