FlightGear - Flight Simulator FGAddon

- Backseat model fixes (VSD)
- Revised roll ratio schedule which could cause difficulties in controlling roll
- Added extra dimension (stab angle) to roll due to aileron. This was always in the original data.
- Control surfaces should always have been active (with emergency ratios) when no hydraulic pressure as there is a mechnical linkage from the stick to each surface.