Shuffled some additional view parameters into the fgVIEW class.
Changed tile-radius to tile-diameter because it is a much better
name.
Added a WORLD_TO_EYE transformation to views.cxx. This allows us
to transform world space to eye space for view frustum culling.
Added a command line option to specify fov.
Adjusted terrain color.
Root path info moved to fgOPTIONS.
Added ability to parse options out of a config file.