Added the undofile() function.  Updated runtime files.
diff --git a/runtime/doc/message.txt b/runtime/doc/message.txt
index 1026815..6bf8580 100644
--- a/runtime/doc/message.txt
+++ b/runtime/doc/message.txt
@@ -585,6 +585,7 @@
 Messages like this appear when starting up.  This is not a Vim problem, your
 X11 configuration is wrong.  You can find a hint on how to solve this here:
 http://groups.yahoo.com/group/solarisonintel/message/12179.
+[this URL is no longer valid]
 
 							*W10*  >
   Warning: Changing a readonly file