FlightGear - Flight Simulator FGAddon

By Ludovic Brenta <ludovic@...>

* Improve the FDM taking hints from the Citation Bravo. No more nose dipping!
* Add an unobstrusive ZKV500 GPS instrument on the captain's side.
* Add an aftermarket Control Display Unit on the pedestal!
* Implement speed and dynamic (!) load factor limits.
* Fix two bugs in the ZKV500 GPS instrument; pending merge into the base FlightGear package.
* Bug fix: make the GPS instrument screen appear entirely with backlight!
* Bug fix: make one more absolute path relative.
* Bump system and FDM aircraft ratings two notches.

Many thanks to Ludovic Brenta for this outstanding improvement!