trying to make consistent the internal matrix structure, this is a "restore point" before turning the sparse_matrix into a double-personality (coordinate-compressed) structure
testing some stuff
added a schizophrenic personality to the sparse matrix: it alternates between compressed/uncompressed states as necessary. this is a bit based on Eigen, maybe I should have used that instead.
updated pardiso to this new sparse matrix
updated to this new sparse matrix
updated to this new sparse matrix
updated to this new sparse matrix
cleanup