Changed the name of GenericModel to ModelWrapper, to clarify its role.  This is a backend change only.
Changed the name of GenericModel to ModelWrapper, to clarify its role.  This is a backend change only.

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