Apparently avoiding explicit zeros does not help much
Apparently avoiding explicit zeros does not help much

as benchmark on skl show, so we delete it again

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