Vim 8.1 release

Update version number and information.  Fix a couple of tests.
diff --git a/runtime/doc/usr_90.txt b/runtime/doc/usr_90.txt
index 28d0c32..5ecba60 100644
--- a/runtime/doc/usr_90.txt
+++ b/runtime/doc/usr_90.txt
@@ -1,4 +1,4 @@
-*usr_90.txt*	For Vim version 8.0.  Last change: 2008 Sep 10
+*usr_90.txt*	For Vim version 8.1.  Last change: 2008 Sep 10
 
 		     VIM USER MANUAL - by Bram Moolenaar