Random seed initialisation

[jnahlers]

Just a heads up - I was trying to get reproducible 2D foams by setting the seed for generation. The code uses both random and numpy.random, so to get reproducible objects I had to set both seeds:

import numpy as np
np.random.seed(42)
import random
random.seed(42)

I'd recommend only uses one random library, or letting the user set a seed parameter in the foam2d/foam3d functions.

[dkazanc]

thanks @jnahlers, makes perfect sense to use one API. If you have the updated demo please do a PR and we update the code in the repo? Many thanks.