1d Godunov Shock Tube Solver using Riemann solver from Marti and Muller

• High-resolution Predictor-Corrector
• Artificial viscosity is included but generally not necessary
• Easily testable switches between upwind and Riemann.
• Also Upwind when Riemann throws an exception.
• USES PRIMITIVE VARIABLES FROM ELEMENTS ON LEFT/RIGHT. NOT CONSERVED QUANTITIES.

TBD. Uses cmake. See the configure build script.

For run information try

 rshock_god4 --help