libvb/Spheroidal: basic transforms (translation, scaling, inversion)
libvb/Spheroidal: do not draw points that should be at infinity
libvb/Spheroidal: circlepack including with vertices of degree 2
libvb/Spheroidal: Möbius maps and default translation for linear maps
libvb/Spheroidal: one fewer endl
libvb/Spheroidal: in möbius transform, us a more numerically stable version
tests/test_hypermap: a dessin of some tree