Combine all the network functions into a class

[johnlees]

No description provided.

[johnlees]

I think the desired interface for this package is eventually going to look something like this:

from pp_netlib import pp_graph
pp_graph.load()
pp_graph.save()
pp_graph.create()
pp_graph.convert()
pp_graph.assign()
pp_graph.prune()

We can talk about how to achieve this, but I think probably making a python class is best

[bruhad-dave]

Have this interface as a WIP