Bump version to 1.16.4

debian/changelog

@@ -1,3 +1,9 @@
+dpkg (1.16.4) UNRELEASED; urgency=low
+
+  * 
+
+ -- Guillem Jover <guillem@debian.org>  Fri, 27 Apr 2012 10:33:09 +0200
+
 dpkg (1.16.3) unstable; urgency=low
 
   [ Guillem Jover ]