[DEV] open new 1.4 development branch

This new branch is based on 1.3.18, which 1.4-dev0 is 100% equivalent to.
diff --git a/VERDATE b/VERDATE
index 09d6e25..b22713f 100644
--- a/VERDATE
+++ b/VERDATE
@@ -1 +1 @@
-2009/05/10
+2009/06/09