mark dead code

git-svn-id: http://www.observium.org/svn/observer/trunk@1912 61d68cd4-352d-0410-923a-c4978735b2b8

includes/unix-graphing.php

@@ -1,5 +1,8 @@
 <?php 
 
+## FIXME not used, do we still need this?
+## included from includes/unix.php, which is also unused
+
 function mailerrorgraphUnix ($rrd, $graph, $from, $to, $width, $height, $title, $vertical) {
   global $config, $installdir;
   $database = $config['rrd_dir'] . "/" . $rrd;