FlightGear - Flight Simulator FGAddon

747-400: FDM updates
- Fix JSBSim warnings (thanks to Jonathan)
- Add aeroelastic effect on lift due to load factor (thanks to Jonathan)
- Improve flap load relief system

J3Cub: Remove superfluous JSBSim tag pairs

SZD55: instrument update

Alouette-III:Fix JSBSim tags

F-15: FCS rework, 3d optimizations

- 3d model load optimisations; textures to power of two, model merge (canopy, stores into main model), livery texture usage removed from interior model.
- Fixed exterior stores visibility over MP
- Added ground attack default load (MK-84 x 3)
- Joshua Davidson: FCS reworked (each surface modelled)
- Joshua Davidson: Autopilot improved
- Joshua Davidson: CAS modelling improved
- Nikolai V. Chr. : missile tracking fixes

SpaceShuttle: fix invalid JSBSim tags

Correcting last commit's mess; SP-50/Kurs-MP: Balance knobs fith functionality; little QuickStartUpGuide additions

Lockheed1049h 3.0.4: minor bug fixes

* Nasal/Lockheed1049h-fuel.nas (fuel_flow_timer): bug fix when zero fuel flow;
use true airspeed instead of groundspeed; makes tuning independent of wind.
Add range-total-nmi from odometer and range-remaining-nmi.

Kurs-MP: new SDU selector switch; UPDB switchable between ARK and Nav; adding new super-secret 023M; model adjustments (mostly materials)

747-400: fix fuel dialog menu item