True Cpu Load On device with GetIdleTime supported
Draw glide amoeba shaded area unconditionally, if:
- we are flying
or
- we are in simmode, at least 100m above ground.

	modified:   Draw/DrawTerrainAbove.cpp
TraceThread option inside TraceThread.h , let you use SHOWTHREAD(message) and see where a function is executed, inside which thread.
Of course it should be disabled out of testing purposes.
To be used using Tail.exe on pc, so you can see in real time what is happening .
Merge branch 'CpuLoad' of http://github.com/brunotl/LK8000
Prevent division by zero in CpuLoad function by bruno
	modified:   CpuLoad.cpp
Improve airspace outline only border visibility
	modified:   LKObjects.cpp
FlarmRadar topview clipped by overlaying
	modified:   Draw/DrawFlarmRadar.cpp
Call AirspaceWarning from CommonProcessTimer only at 1Hz, not at 2Hz.
	modified:   Dialogs/dlgLKAirspaceWarning.cpp
	modified:   ProcessTimer.cpp
Disable TRACETHREAD for the boys