Add the settabvar() and gettabvar() functions.
Various runtime file updates.
diff --git a/runtime/doc/usr_27.txt b/runtime/doc/usr_27.txt
index aa24a26..1098f44 100644
--- a/runtime/doc/usr_27.txt
+++ b/runtime/doc/usr_27.txt
@@ -77,7 +77,7 @@
Note:
The use of "\" items in search patterns depends on the 'magic' option.
- In this chapters we will assume 'magic' is on, because that is the
+ In this chapter we will assume 'magic' is on, because that is the
standard and recommended setting. If you would change 'magic', many
search patterns would suddenly become invalid.