[Numeric] ANN: linear-circuit, comfort-graph, resistor-cube

[Henning Thielemann]

I have uploaded the package linear-circuit that computes the resistance of 
a network of resistors using linear algebra from hmatrix:
    https://hackage.haskell.org/package/linear-circuit

This package also demonstrates the use of a graph structure that is an 
alternative to fgl:
    https://hackage.haskell.org/package/comfort-graph

The resistance computation is a generalization of a small example for 
computing the resistance of a cube of resistors:
    https://hackage.haskell.org/package/resistor-cube