Added count to GenericGeometry.  This now means that the number of pores in a geometry can be found with all the same tricks as networks and fluids (Np,Nt,num_pores,num_throats, and now count) - This was basically cut-and-paste, but it's only a few lines so not worth figuring out how to inherit it
Added count to GenericGeometry.  This now means that the number of pores in a geometry can be found with all the same tricks as networks and fluids (Np,Nt,num_pores,num_throats, and now count)
- This was basically cut-and-paste, but it's only a few lines so not worth figuring out how to inherit it


Former-commit-id: da1c5343a70c5646e760d2f0068c9af85698e1e2
Former-commit-id: 8726dd4c293220c930ada3a28f77abac467cd904
amdouglas/OpenPNM,stadelmanma/OpenPNM,PMEAL/OpenPNM,TomTranter/OpenPNM,amdouglas/OpenPNM