pi-DoMUS redesign

[asartori86]

We might need to redesign the structure of pi-DoMUS and probably also the BaseInterface and PDESystemInterface.

I would like to collect here the design flaws you note and/or suggestions.

[asartori86]

What if the time stepper (e.g., imex, ida, arkode) are selected through the interface we derive (instead from parameter file)? In this way we will not have many initial time and final time in parameter file, since the stepper is unique