adjust q_inc so that we perform about 10 sieving tests
adjust q_inc so that we perform about 10 sieving tests

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