[las.c] * check_leftover_norm now also deals with 4 large primes 	* added code to produce statistics about the success of cofactorization 	  with respect to the bitsize of both cofactors (rational and 	  algebraic side), and to use that information to avoid cofactorization 	  when the success probability is below some given threshold.
[las.c] * check_leftover_norm now also deals with 4 large primes
	* added code to produce statistics about the success of cofactorization
	  with respect to the bitsize of both cofactors (rational and
	  algebraic side), and to use that information to avoid cofactorization
	  when the success probability is below some given threshold.

	  On a given example, the cofactorization time decreases from 311s to
	  241s with the first change (check_leftover_norm) and then to 133s
	  with the second one (statistics).

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