All network generators should take an origin keyword

[jgostick]

This is super simple to do after the fact by adjust the 'pore.coords' array, but it would be handy for other reasons to allow an origin keyword to offset to the network upon creation. The default would obviously be [0, 0, 0]

[jgostick]

This is almost too easy, you just add it to net['pore.coords']

[jgostick]

just do net['pore.coords'] += [3, 3, 3]

It would only add cruft to the init calls