Geom/Phys pores() and throats() now work only locally!
- geom.pores() will return 0-999, even if in the main network, they correspond to 1000-1999
- if you want main network numbers you do pn.pores(geom.name)
- this is more self consistent, but could also be confusing I suppose....time will tell
- this solves the reverse lookup problem James mentioned
- it also makes the code amazingly clean....GenericGeometry, GenericPhysics and GenericFluid are basically just init statements now!  They act exactly like the other objects.
Small bugfix in Physics Health check