Added some defaults to the Cubic generator, fixed a type
Renamed 'declare_pore_property' and 'declare_throat_property' to 'new_pore_property' and 'new_throat_property', and changed all references throughout the code (which were minimal since it's not really used yet).
Also added 'get_pore_property' and 'get_throat_property' methods, just to be thorough.
Ongoing documentation updates