Get rid of the ugly CMD_CHFLAG macro and use a const string (eg "dDU") in the

command entry structs and a couple of functions to check/set the flags.

cmd-bind-key.c

@@ -46,7 +46,7 @@ struct cmd_bind_key_data {
 const struct cmd_entry cmd_bind_key_entry = {
 	"bind-key", "bind",
 	"[-cnr] [-t key-table] key command [arguments]",
-	0, 0,
+	0, "",
 	NULL,
 	cmd_bind_key_parse,
 	cmd_bind_key_exec,