Vim 8.1 release

Update version number and information.  Fix a couple of tests.
diff --git a/runtime/doc/tips.txt b/runtime/doc/tips.txt
index d15b4bc..3698348 100644
--- a/runtime/doc/tips.txt
+++ b/runtime/doc/tips.txt
@@ -1,4 +1,4 @@
-*tips.txt*      For Vim version 8.0.  Last change: 2009 Nov 07
+*tips.txt*      For Vim version 8.1.  Last change: 2009 Nov 07
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar