Improved parachute targeting; tidied and added more info to the landing screen.

* Added time to land / exit atmosphere to the Landing screen
* Added parachute targeting information (quality and amount of data being used)
* Tidied up Landing screen
* Increase the amount of error added to error simulations to improve parachute targeting
* Increased the number of predictions used for parachute targeting to 40
* Changed landing gear to always lower at 1000m AGL regardless of the landing step
* Removed redundant code
* Changed to parachute targeting to discard non-correlating data, but always continue trying to build a good dataset