(svn r13626) -Fix (r11871): signals were not updated when player removed signals from nonexistent track sharing bits with existing track
So disallow removing signals from nonexistent track
/* $Id$ */
/** @file news_gui.h GUI functions related to the news. */
#ifndef NEWS_GUI_H
#define NEWS_GUI_H
void ShowLastNewsMessage();
void ShowMessageOptions();
void ShowMessageHistory();
#endif /* NEWS_GUI_H */