We probably should issue a warning about excessive memory usage when using Cholmod with large grids. Perhaps over 5M cells?

Circuitscape/Circuitscape.jl#232 (comment)

A warning that may be clear is something like "Cholmod is a spare direct solver that consumes a lot of memory. A landscaspe with 5M cells will require roughly XGB of RAM. Please use cg+amg

Maybe use something like this: https://github.com/drdoctr/doctr
The problem is that when we edit and build the docs, commit and push, the description of the commit is full of html pages and it is unclear what exactly was changed.

In src/circuit_components.jl, ports are assumed to be identified by Strings, but this not enforced elsewhere in the package. Probably the circuit components should have a type parameter for the port names.

See also #22; potentially one carefully thought out PR could address both issues.

This is a list of different shortcuts that would be super useful to include in the API. There is currently a long way to do all of these things. It would be useful to add the following shortcuts into the API to make the tools easier to use and work with.

• set the top instance
  Long way:
  top = Instance()
top.reference = top_definition
netlist.top_instance = top
  could be simplif