Added link to external pixma backend.

unsupported/canon-pixma-mp150.html

@@ -34,8 +34,8 @@
     </p>
     <h2>Comments</h2>
     <p>
-      This <a href="http://pixma.schewe.com/">stand-alone driver</a> si work in
-      progress and may support the scanner later..
+      This scanner is supported by the external <a
+      href="http://home.arcor.de/wittawat/pixma/">pixma backend</a>.
     </p>
     <h2>Output of /proc/bus/usb/devices or sane-find-scanner -v -v or lsusb -vv</h2>
     <pre>

unsupported/canon-pixma-mp170.html

@@ -34,8 +34,9 @@
     </p>
     <h2>Comments</h2>
     <p>
-      This <a href="http://pixma.schewe.com/">stand-alone driver</a> si work in
-      progress and may support the scanner later..
+    <p>
+      This scanner is supported by the external <a
+      href="http://home.arcor.de/wittawat/pixma/">pixma backend</a>.
     </p>
     <p>
       The PIXMA MP170 is a printer and a scanner. It also had a flashcard reader.

unsupported/canon-pixma-mp450.html

@@ -34,8 +34,9 @@
     </p>
     <h2>Comments</h2>
     <p>
-      This <a href="http://pixma.schewe.com/">stand-alone driver</a> si work in
-      progress and may support the scanner later..
+    <p>
+      This scanner is supported by the external <a
+      href="http://home.arcor.de/wittawat/pixma/">pixma backend</a>.
     </p>
     <h2>Output of /proc/bus/usb/devices or sane-find-scanner -v -v or lsusb -vv</h2>
     <pre>

unsupported/canon-pixma-mp500.html

@@ -35,8 +35,8 @@
     </p>
     <h2>Comments</h2>
     <p>
-      This <a href="http://pixma.schewe.com/">stand-alone driver</a> si work in
-      progress and may support the scanner later..
+      This scanner is supported by the external <a
+      href="http://home.arcor.de/wittawat/pixma/">pixma backend</a>.
     </p>
     <h2>Output of /proc/bus/usb/devices or sane-find-scanner -v -v or lsusb -vv</h2>
     <pre>