[ADOL-C] Signature of Hessian driver

[Philipp Bender]

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Dear Kshitij,

I did not come up with this because of code aesthetics :), more
because I integrate ADOL-C with an optimizer which asks me to evaluate
the Hessian and gradient at a specific point, which is passed as const
double*. So I help myself with this:

#ifdef DEBUG

  std::vector< double > x_non_const(x, x+n);
  hessian(0, n, x_non_const.data(), Hess);
  // memory is equal, x_non_const has not been touched ...
  assert(std::memcmp(x_non_const.data(), x, n) == 0);

#else

  double* x_non_const = const_cast<double*>(x);
  hessian(0, n, x_non_const, Hess);

#endif

... which works, but is not really the best construct ever. It should
provide me with the confidence that the values never get touched,
while being still efficient in release mode.

Best regards and thank you,
Philipp
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