Implement SPARSE matrix solver via Cython
LISO uses the SPARSE library for circuit simulation. It should be possible to use Cython code to interface with the library. Now that the solver has been split off from the
Circuit object (e774a0d0) this should be quite straightforward to do. With the same library it should be possible to produce identical results to LISO.
Note that this will probably need a Makefile to run during