If a blank geom was added, vsp would seg fault because the bounding
box values were left at the reset values which resulted in an number
too big for an integer being stored to the bounding box length variables.
Fix problem with root airfoil not reading from file.
Increase basic tessellation parameter limit.

You should not need to go to 1000 any more, but 100 is an arbitrary limit,
so we may as well increase it to allow for any need.