Added the undofile() function.  Updated runtime files.
diff --git a/runtime/doc/print.txt b/runtime/doc/print.txt
index 49b7dfc..73a3182 100644
--- a/runtime/doc/print.txt
+++ b/runtime/doc/print.txt
@@ -490,7 +490,7 @@
 
 You can find descriptions of the various fonts in the read me file at
 
-  http://examples.oreilly.com/cjkvinfo/adobe/00README
+  http://examples.oreilly.de/english_examples/cjkvinfo/adobe/00README
 
 Please read your printer documentation on how to install new fonts.