Make voltages ac/dc agnostic
Blank failing tests for now
Off-diagonal elements should be negative
Add start of DC tests
Add the ability to set a reference node
Fix B matrix creation, add DC G+B matrix tests
Add C matrix
Add overall createMatrix function
Refactor to refer to matrix as AMatrix
Should be copying complexes, not using same obj throughout...
Add Z Matrix
Complex Number operations should return new numbers
add missing dup function in Sylvester
Add initial solving algorithm for real numbers
Add initial API for getting V, I; add circuit tests
Fix algorithm to handle parallel comps between two nodes
Fix bug causing algorithm to be node-order-dependent
Add tests for multi-voltage circuits and diff ref node