scanner group access with and without acl support

ChangeLog

@@ -1,3 +1,7 @@
+2012-04-20 Rolf Bensch <rolf at bensch hyphen online dot de>
+	* tools/sane-desc.c: tools/udev/libsane.rules supports scanner group
+	access to any scanner, with and without acl support. 
+
 2012-04-17 Rolf Bensch <rolf at bensch hyphen online dot de>
 	* backend/pixma.c, backend/pixma_sane_options.c, po/de.po:
 	New description for device specific option "source".

tools/sane-desc.c

@@ -3621,6 +3621,8 @@ print_udev (void)
 
   if (mode == output_mode_udevacl)
     printf("\nENV{libsane_matched}==\"yes\", RUN+=\"/bin/setfacl -m g:%s:rw $env{DEVNAME}\"\n", DEVGROUP);
+  else
+    printf ("\nENV{libsane_matched}==\"yes\", MODE=\"664\", GROUP=\"scanner\"\n");
 
   printf ("\nLABEL=\"libsane_rules_end\"\n");
 }