Vim 8.1 release

Update version number and information.  Fix a couple of tests.
diff --git a/runtime/doc/arabic.txt b/runtime/doc/arabic.txt
index 5d0e9f3..0572b85 100644
--- a/runtime/doc/arabic.txt
+++ b/runtime/doc/arabic.txt
@@ -1,4 +1,4 @@
-*arabic.txt*	For Vim version 8.0.  Last change: 2010 Nov 13
+*arabic.txt*	For Vim version 8.1.  Last change: 2010 Nov 13
 
 
 		  VIM REFERENCE MANUAL	  by Nadim Shaikli