Renamed clone_object to ghost_object so as not to be confused with clone_simulation.  A ghost implies that it is not registered anywhere in the simulation, while a clone results in fully legitimate objects.
Renamed clone_object to ghost_object so as not to be confused with clone_simulation.  A ghost implies that it is not registered anywhere in the simulation, while a clone results in fully legitimate objects.

stadelmanma/OpenPNM,amdouglas/OpenPNM,PMEAL/OpenPNM,TomTranter/OpenPNM,amdouglas/OpenPNM