Additions to the binary file format to make it *much* more flexible.

Additions to the binary file format to make it *much* more flexible.
For each major primative type: points, triangles, fans, and strips, you
can specify an index list of vertices, normals, colors, and texture
coordinates.  You can skip any of these you like to save on space.

Note that the work for this has only been done in the file format reader
and writer.  The FlightGear loader for instance still needs to have
support for this built in.

This is is one more small step towards runway lighting.