>    To keep track of it along iteration. This has been superseded by the probe
>    system.

OK, but in the non CV estimator, isn't it used? I would expect that the
dual gap would be a good stopping criterion in this situation. I think
that we had a conversation on that. No use reminding me what the
conclusion were, just go ahead with what you think is right and drop it
if you feel that there is no use for it.