patch 7.4.1161
Problem:    ":argadd" without argument is supposed to add the current buffer
            name to the arglist.
Solution:   Make it work as documented. (Coot, closes #577)
diff --git a/src/ex_cmds.h b/src/ex_cmds.h
index 4b5f684..78c0afa 100644
--- a/src/ex_cmds.h
+++ b/src/ex_cmds.h
@@ -128,7 +128,7 @@
 			BANG|FILES|EDITCMD|ARGOPT|TRLBAR,
 			ADDR_LINES),
 EX(CMD_argadd,		"argadd",	ex_argadd,
-			BANG|NEEDARG|RANGE|NOTADR|ZEROR|FILES|TRLBAR,
+			BANG|RANGE|NOTADR|ZEROR|FILES|TRLBAR,
 			ADDR_ARGUMENTS),
 EX(CMD_argdelete,	"argdelete",	ex_argdelete,
 			BANG|RANGE|NOTADR|FILES|TRLBAR,