Starting with r3558, the nose and nose gear would no longer be visible
over multiplayer because they use nonstandard properties. As a
interim solution, I am now aliasing these to generic properties and
transmitting them over multiplayer. A better long-term solution for
the nose gear would be only to use the standard property
gear/gear[0]/position-norm but make the animation more complex (i.e.
in animate doors between 0 and 0.2, animate the gear between 0.2 and
0.8 and animate the small doors again between 0.8 and 1.0, or
something like that). This would save 3 floats in each MP packet,
i.e. 18 bytes.
For the ailerons and rudder, use standard properties directly.
