Revise catapult geometry to fix the yawing moment when not on the nimitz
Revised hook geometry to prevent the aircraft being pulled under deck. The rationale I'm applying is that although the hook is attached at the back the force will act forwards of the CG. This helps to keep the model level and may be a comprimise.
Improvements to carrier landings;

1. Fix the bounciness and inbalance in the struts. This was causing the oscillations so all gear struts now have the same springiness and damping.
2. Correctly set the VRP - this was causing the hook not to engage too well as it was effectively offset. This is also the cause of most of the aligment issues that I've previously had with the gear/contact points.
3. Improve the special carrier handling startup (still not 100% sure why I need this - but it is currently necessary).
Merge branch 'master' into flightgear-release