Output mass deficit after simulation

[Sierd]

We are dealing with a slight loss of mass in some simulations (in the order of 1-2% of the total transported sediment volume).

Screen output after each simulation will give the user feedback on this.

This is a feature request for this screen ouput.

Screen output should state:

Mass deficit =

aeolis-python/aeolis/tests/integration_tests/test_model.py

Line 106 in 2c92198

delta_mass = (delta_zb * density * 0.5) / (1 - porosity)

Total Transported mass =

aeolis-python/aeolis/tests/integration_tests/test_model.py

Line 107 in 2c92198

delta_pos = (