send_signal
send_signal(ship, "striking her colours!");
send_signal(to, message);
send_signal(from, message);
send_signal(to, message);
send_signal(sp, "prize crew overthrown");
void send_signal(struct ship *ship, const char *astr);
send_signal(ms, buf);
send_signal(ms, message);
send_signal(from, message);
send_signal(from, message);