updated for version 7.3.631

Problem:    Cannot complete user names.
Solution:   Add user name completion.  (Dominique Pelle)

src/vim.h

@@ -782,6 +782,7 @@ extern char *(*dyn_libintl_textdomain)(const char *domainname);
 #define EXPAND_OWNSYNTAX	39
 #define EXPAND_LOCALES		40
 #define EXPAND_HISTORY		41
+#define EXPAND_USER		42
 
 /* Values for exmode_active (0 is no exmode) */
 #define EXMODE_NORMAL		1