Vim 8.1 release

Update version number and information.  Fix a couple of tests.
diff --git a/runtime/doc/rileft.txt b/runtime/doc/rileft.txt
index 962b890..17bfdba 100644
--- a/runtime/doc/rileft.txt
+++ b/runtime/doc/rileft.txt
@@ -1,4 +1,4 @@
-*rileft.txt*    For Vim version 8.0.  Last change: 2006 Apr 24
+*rileft.txt*    For Vim version 8.1.  Last change: 2006 Apr 24
 
 
 		  VIM REFERENCE MANUAL    by Avner Lottem