Added a BasePhyscis subclass
- It's still a bit bare, but it's started
- Interesting problem...it needs to check for the existence of the required variables for each physics and only add the right ones to the object
Started adding a Tortuosity algorithm
- This uses Djikstra's shortest path search and finds the distance between any pore and all others.
- Still in-progress...I'm not sure what weighting to apply to edges
Merge branch 'develop' of https://github.com/PMEAL/OpenPNM into develop