BOH updated and ported to MacOS X

• makes the game run natively on MacOS X Tiger/Leopard machines;
  
• adds zooming to full screen modes;
  
• allows the choice of the screen mode among those notified by the system;
  
• replaces zooming routines with more optimized ones (especially 3x and 4x);
  
• adds the possibility of disabling interpolation (for slow computers);
  
• adds the possibility of disabling the rendering of barriers;
  
• improves a bit the original themes;
  
• enriches slightly the Evil Masters AI;
  
• adds timer ticking during time-limited missions;
  
• adds map zooming;
  
• adds the option of sorting missions by difficulty;
  
• allows the use of joypads/joysticks with just 1 button;
  
• fixes the following bugs: bad joypad handling (detection was inhibited by a '2' in place of a '1'; sometimes up/down movement could stick); [PAGE UP/DOWN] handling (repeat delay handling was missing); a bad optimization of ray-tracing routine (which had no practical effects thanks to the way maps and themes were made);
  
• improves and extends the user's manual;
  
• links the AmigaOS 4 version to libSDL 1.2.13;
  
• applies some other minor changes.