Vim 8.1 release

Update version number and information.  Fix a couple of tests.
diff --git a/runtime/doc/if_mzsch.txt b/runtime/doc/if_mzsch.txt
index a9a0313..f118b17 100644
--- a/runtime/doc/if_mzsch.txt
+++ b/runtime/doc/if_mzsch.txt
@@ -1,4 +1,4 @@
-*if_mzsch.txt*  For Vim version 8.0.  Last change: 2017 Oct 08
+*if_mzsch.txt*  For Vim version 8.1.  Last change: 2017 Oct 08
 
 
 		  VIM REFERENCE MANUAL    by Sergey Khorev