display system hostname and some memory info on dashboard

hostname may be useful in situations where several froxlors are
reverse-proxied on a single webserver

templates/Sparkle/admin/index/index.tpl

@@ -211,6 +211,10 @@ $header
 						</tr>
 					</thead>
 					<tbody>
+						<tr>
+							<td>{$lng['admin']['hostname']}:</td>
+							<td>{$system_hostname}</td>
+						</tr>
 						<tr>
 							<td>{$lng['admin']['serversoftware']}:</td>
 							<td>{$_SERVER['SERVER_SOFTWARE']}</td>
@@ -227,6 +231,10 @@ $header
 							<td>{$lng['admin']['webserverinterface']}:</td>
 							<td>$webserverinterface</td>
 						</tr>
+						<tr>
+							<td>{$lng['admin']['memory']}:</td>
+							<td><pre>$memory</pre></td>
+						</tr>
 						<tr>
 							<td>{$lng['admin']['sysload']}:</td>
 							<td>$load</td>