message: ConstrainedSolver::Mult(): correctly set lagrange multiplier solution.
diff: @@ -663,6 +663,8 @@ void ConstrainedSolver::Mult(const Vector& f_and_r, Vector& x_and_lambda) const
  Vector ref_constraint_rhs(f_and_r.GetData() + A.Height(), B.Height());
  constraint_rhs = ref_constraint_rhs;
  PrimalMult(workb, workx);
  + Vector ref_constraint_sol(x_and_lambda.GetData() + A.Height(), B.Height());
  + GetMultiplierSolution(ref_constraint_sol);
  }
  }
  