[Clp] manual pivot in dual simplex

[Richard Waltz]

Is it possible to manually perform a pivot in the Clp dual simplex method?
I have in mind something like the functionality described by the comments
below:

/* Pivot out a variable and choose an incoing one.  Assumes dual
   feasible - will not go through a reduced cost.
   Returns step length in theta
   Returns ray in ray_ (or NULL if no pivot)
   Return codes as before but -1 means no acceptable pivot
*/
int
ClpSimplexDual::pivotResult()
{
  abort();
  return 0;
}

Thanks,
-Richard
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