Added note to XSane as temporarily offline.

sane-frontends.html

@@ -29,7 +29,7 @@
     
     <ul>
       <li>
-	<a href="http://www.xsane.org" target="_top">XSane</a>
+	<a href="http://www.xsane.org" target="_top">XSane (temporarily offline!)</a>
 	- improved graphical frontend for scanners:
 	<ul>
 	  <li>