patch 7.4.709

Problem:    ":tabmove" does not work as documented.
Solution:   Make it work consistently.  Update documentation and add tests.
            (Hirohito Higashi)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    709,
 /**/
     708,
 /**/