libvb/Constellation1: extend to multiprecision
libvb/NumberTheory: look at higher degree if given more digits
libvb/Constellation1: start computing jacobian explicitly (awful! should not have precomputed!)
libvb/Constellation1: don't try to be too smart
libvb/math: fix computation for gmp numbers
libvb/Constellation1: convergence is quadratic, so derivative is correct!