Implement Output result after multigrid

[TimoH447]

After execution the program should print out all important arguments which were used: i.e. grid size N, levels, dimension, smoother used, ... and the results: i.e. Number of iterations, error, is converged.

[Jupyter01]

Added the following outputs:

• grid size N

• number of grids, levels

• dimension

• number of smoothing operations, v

• whether F-cycle is used or not

• Number of iterations

• final error

• whether the algorithm converged or not

• average time over multiple runs (if specified)

• time of single run (if specified)

[TimoH447]

Wollen wir das in den Main mergen?