downcase all keys - we also match on downcased user-agent

src/gen_dcs_classifier.pl

@@ -640,6 +640,8 @@ foreach (split(/[\n\r\f]/, $$dbref)) {
     die "empty type on line ".$line
 	unless (defined($type) && ($type ne ""));
 
+    $key = lc($key);
+
     # remove any subkey which is wholly contained in another subkey
     # sort reverse by length, only remove shorter ones
     my @sks;