Initial GUI

Implement an initial GUI using PyQT.

• Create a dialog for loading RAS projects. Handle steady and unsteady RAS projects through this dialog.
  • Use fluegg-tutorial-steady-ras.ipynb as a steady example.
  • Use unsteady simulation.ipynb as an unsteady example.
  • Take a look at the RASProject class to get an idea of what's available from RAS. Submit a feature request if there are things you need that aren't available through the class interface.