Even fewer iterations for test_ulong_nextprime() since it is time-consuming
Even fewer iterations for test_ulong_nextprime() since it is time-consuming

mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs