Updated stats for parallel scenery build server. Increased max node count per tile to 4000. Additional degeneracy and bad polygon screening. Built a generalized polygon tesselater out of Shewchuk's triangulator. Added a routine to calculate the area of an arbitrary 3d triangle.
Bug fixes in the airport generator util.
Added a test program for the triangulator. Fixed a bug in Shewchuk's triangulator. Updated runway texture layout in designator block. Write out the AirportArea hole that has been segmented so it fits with the airport model that goes inside the hole in the terrain. Handle too-short visual runways for now by converting them to simple runways.