Make system parameter names a public API
Parameters are great, let's have more of them!
Specifically, we could make the system parameters more discoverable by considering the parameters that the system depends on a public property. The implementation would be as easy as looping over the
hoppings and doing a set join on these.
We could then use those to provide a rich representation, e.g.
system with 2 leads and 100 sites that depends on ('mu', 't').