daemon: pay command.

This is the command an actual user would use: it figures out the fee
and route, and pays it if it can.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

daemon/jsonrpc.c

@@ -256,6 +256,7 @@ static const struct json_command *cmdlist[] = {
 	&close_command,
 	&newaddr_command,
 	&accept_payment_command,
+	&pay_command,
 	/* Developer/debugging options. */
 	&echo_command,
 	&rhash_command,