Vim 8.1 release

Update version number and information.  Fix a couple of tests.
diff --git a/runtime/doc/debugger.txt b/runtime/doc/debugger.txt
index 7976395..9aa2fb8 100644
--- a/runtime/doc/debugger.txt
+++ b/runtime/doc/debugger.txt
@@ -1,4 +1,4 @@
-*debugger.txt*  For Vim version 8.0.  Last change: 2017 Nov 21
+*debugger.txt*  For Vim version 8.1.  Last change: 2017 Nov 21
 
 
 		  VIM REFERENCE MANUAL    by Gordon Prieur