avoid int overflow in task drawing using clipping
  - it's also avoid to draw not visible parts of task and reduce cpu overhead.
fix int overflow in topology at hight zoom level ( <15m with france_full.lkm )
fix integer overflow in irotate(...)
 ( used in screen coordinate calculation of waypoint )
add INT_OVERFLOW=y for debuging int overflow
Fix 4.0a timefix problem with logger, seconds logged being 60 rejected by GPSdump
	modified:   Logger/Logger.cpp
Fix 4.0 and 3.0 bug crashing LK while loading CUP file with huge comment fields.
Buffer overflow, forgotten check on size before tcscpy.
	modified:   ParseCUP.cpp
Merge branch 'InOverflow' of http://github.com/brunotl/LK8000 into bruno