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+[this URL is no longer valid]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