Add the settabvar() and gettabvar() functions.
Various runtime file updates.
diff --git a/runtime/doc/usr_30.txt b/runtime/doc/usr_30.txt
index c15cb20..34210c6 100644
--- a/runtime/doc/usr_30.txt
+++ b/runtime/doc/usr_30.txt
@@ -362,7 +362,7 @@
 	   echo "-------" ~
 	fi ~
 
-Start off by setting these option: >
+Start off by setting these options: >
 
 	:set autoindent shiftwidth=3