Add link to new vlan tag history page.

www/showstats.php3

@@ -51,6 +51,7 @@ echo "<b>Show: <a class='static' href='showexpstats.php3'>
 if ($isadmin) {
     echo "<a class='static' href='showsumstats.php3'>, Summary Stats</a>";
     echo "<a class='static' href='shownodehistory.php3'>, Node History</a>\n";
+    echo "<a class='static' href='showvlantaghistory.php'>, VLan History</a>\n";
 }
 echo "</b><br>\n";