Changes to the late_pore_filling model.  If this method is tested in our unit tests, they will probably fail. - It now calculates 'pc_star' and saves it a prop on the phys object if it's not found (only calculating once saves time). - Updated docstring and altered the arguments a bit. - Removed the wetting phase / non-wetting phase optionality.  It now returns non-wetting phase fraction.
Changes to the late_pore_filling model.  If this method is tested in our unit tests, they will probably fail.
- It now calculates 'pc_star' and saves it a prop on the phys object if it's not found (only calculating once saves time).
- Updated docstring and altered the arguments a bit.
- Removed the wetting phase / non-wetting phase optionality.  It now returns non-wetting phase fraction.

stadelmanma/OpenPNM,PMEAL/OpenPNM,TomTranter/OpenPNM