Revert IDMatrix back to csr
Revert IDMatrix back to csr

on M100 hyb is very slow and ell does not work because of outlier rows

feltor-dev/feltor,mwiesenberger/feltor,feltor-dev/feltor,mwiesenberger/feltor,feltor-dev/feltor,mwiesenberger/feltor,mwiesenberger/feltor,feltor-dev/feltor