| Done
--------------------------------------------------------------------------
+7/21/98 - add a --enable/disable-sound option.
+
+7/11/98 - Ground collision detection
+
+7/3/98 - Generate and store the transform matrix when rendering by
+ material property so we don't have to push, transform, pop
+ continually. See mesa code for gluLookAt()
+
+6/11/98 - convert to static libraries and reduce libtool usage ...
+
+6/11/98 - Converted to GL_FOG_EXP2
+
+5/29/98 - Widened edges of tiles to overlap a bit. This should help
+ reduce floating point induced gaps between tiles.
+
5/27/98 - Rewrote airport list manager using an STL "map" (associative
array) for quick lookup.