Improve multisystem user experience

  • Fix RestartOptions with namespaces: at the moment if one uses the System.RestartOptions syntax, the code does not find the restart folder.
  • Default TDSystemPropagator is static, this is a very different behavior from the legacy code and should be fixed (each system should have a different default propagator)
  • Solve lagging that happens when using different timesteps and timing_exact.
Edited by Ilke Albar