Add minimal tests to ensure pypardiso works with scipy sparse arrays

[haasad]

This package is switching to an array interface, compatible with NumPy arrays, from the older matrix interface. We recommend that you use the array objects (bsr_array, coo_array, etc.) for all new work.

from https://docs.scipy.org/doc/scipy/reference/sparse.html#sparse-matrices-scipy-sparse

New tests are expected to fail until #67 is merged.