(svn r2635) Fix: [ntp/misc] Improve the old pathfinder. Changed it to A* instead of Dijkstra.

- Benchmark shows that NTP is now around 10x faster than NPF.
  - Made IsTunnelTile macro to determine if a tile is a tunnel.
  - Added some useful debugging functions for making tiles red / getting accurate timestamps.
  - Remove old depot finding algorithm.
  - Disable warning for signed/unsigned comparisons.

functions.h

@@ -128,8 +128,8 @@ uint InteractiveRandomRange(uint max);
 
 
 // Used for profiling
-#define TIC() { extern uint32 rdtsc(void); uint32 _xxx_ = rdtsc();
-#define TOC(s) 	_xxx_ = rdtsc() - _xxx_; printf("%s: %d\n", s, _xxx_); }
+#define TIC() { extern uint32 rdtsc(void); uint32 _xxx_ = rdtsc(); static float __avg__;
+#define TOC(s) 	_xxx_ = rdtsc() - _xxx_; __avg__=__avg__*0.99+_xxx_*0.01; printf("%s: %8d %f\n", s, _xxx_,__avg__); }
 
 
 void SetDate(uint date);