getPosition(): it get the exe_time and compute the position tacking in account...

getPosition(): it get the exe_time and compute the position tacking in account the antenna elevation.
setup(): now the turnTrackingOff() is executed inside setupImpl, so it is always called
SetupThread(): if isElevationTrackingEn(), then the turnTrackingOn() is called at the end of the setup.
setElevationTracking(): new method