libvb/Constellation: now that from_points is cheap, use it
libvb/Constellation: normalize the leading term twice, better precision
libvb/cpx: put the quadmath support there
libvb/Hub: work around a boost bug in directory creation
libvb/Constellation: store P and Q rather than a rational fraction
libvb/Constellation: do not premultiply by l, store it separately
libvb/Polynomial: scalar multiplication