allow setting tasks.sieve.las.I and tasks.sieve.las.adjust_strategy
allow setting tasks.sieve.las.I and tasks.sieve.las.adjust_strategy

(nothing done for descent yet).

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