This module sets up riemann problems by using the splitregions object.  It works in both 1D and 2D.  In 2D the interface should be diagonal to the grid although it can be overwritten by setting phi in problem.data.  It outputs a curve file with the solution across the domain in the x-direction or diagonally if in 2D.  For hydro runs it also plots the exact solution for density, pressure, and vx.