Vim 8.1 release

Update version number and information.  Fix a couple of tests.
diff --git a/runtime/doc/version5.txt b/runtime/doc/version5.txt
index b1b71ef..a3e3cfe 100644
--- a/runtime/doc/version5.txt
+++ b/runtime/doc/version5.txt
@@ -1,4 +1,4 @@
-*version5.txt*  For Vim version 8.0.  Last change: 2016 Feb 27
+*version5.txt*  For Vim version 8.1.  Last change: 2016 Feb 27
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar