Added link to backend homepage.

unsupported/mustek-bearpaw-4800ta-pro-ii.html

@@ -57,7 +57,7 @@ D0KNS-013
     <h2>Comments</h2>
     <p>
       Cosmin Pop <a
-      href="http://lists.alioth.debian.org/pipermail/sane-devel/2004-April/010801.html">has
+      href="http://picosconsult.topcities.com/mustek/mustek.html">has
       started to write a backend</a>.
     </p>
     <h2>Output of /proc/bus/usb/devices or sane-find-scanner -v -v</h2>