Fixed bug in the descent script.
Fixed bug in the descent script.

Because indices went out of sync in case the reconstruction process had
duplicate relations (can occur with descent loops, which are rather
ordinary), the reconstructlog call was failing.

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