FlightGear - Flight Simulator FGAddon

707: Nasal/fuel-and-payload.nas: add defensive code to guard against buggy remote
aircraft that pollute our perfectly good local property tree over multiplayer.
at one point I had 45 engines plus an APU under /engines. This caused errors
in then engines_alive Nasal loop, which in turn disabled the (also Nasal-based)
fuel and payload dialogs.

J3Cub: State adjustments.

Citation II:
* deactivate recording of wing-flexer related properties in replay

Fix a gear animation problem

Citation II:
* remove nav1/2 from aircraft-data (recording for next session)

J3Cub: Small correction to states.

J3Cub: Fix ground contact effects, adjust crash contact points, tune ski friction factor, add glacier startup state.

Diamond-Da42: do not show light cones in the preview of fgrun.

Diamond-Da42: multiplayer fixes
- off-by-one bug: the left baggage door was using the altitude in feet, spinning as the
aircraft went up and down
- transmit controls/lighting/landing-light over multiplayer.
- in Models/lights/*.xml and Models/da42.xml, use relative property paths instead
of absolute ones.

Citation II:

* make more paths relative
* record some values, to hopefully someday get wingflex on replay