precise scales to fit the screen
precise scales to fit the screen

I couldn't run `test/compute-scale` on the polyhedronButterfly because the computation of the land bounds yields `[ -4.440892098500626e-16, -1.2247448713915885 ]`. This tiny negative x has no inverse. I've computed the scale with x=0 instead.

Fil/d3-geo-projection,Fil/d3-geo-projection