Computing with the Jacobian of a Genus 2 Curve

Computing with the Jacobian of a Genus 2 Curve- Pari/GP and Mathematica code to: Compute an equation for a genus 2 curve with a given Jacobian; Move points between the analytic Jacobian (as a torus) and the algebraic Jacobian (as a variety); Work with a fundamental domain for 2 dimensional Siegel upper half-space.