Blurb::
Use a simple weighted penalty to manage feasibility
Description::
Finally, constraint infeasibility can be managed in a somewhat more
sophisticated manner than the simple weighted penalty function.  If
the ``constant_penalty`` specification is used, then the simple
weighted penalty scheme described above is used.  Otherwise, the
constraint penalty is adapted to the value ``constraint_penalty/L``,
where L is the the smallest step length used so far.
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