Eigen::NumTraits does not define infinity() or quiet_NaN() about cppad HOT 3 CLOSED

The new relevant code in Eigen is

  // IEEE IEC 6059 special cases.
  if ((numext::isinf)(x) || (numext::isinf)(y))
    return NumTraits<RealScalar>::infinity();
  if ((numext::isnan)(x) || (numext::isnan)(y))
    return NumTraits<RealScalar>::quiet_NaN();

So CppAD would also need an overload for isinf(const CppAD::AD<RealScalar>&) and isnan(const CppAD::AD<RealScalar>&) in order to compile. I'll see if I can concoct a PR.

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@benmwebb I am busy with other things right now. Perhaps you would like to clone the current master and make a try at what you want here.

I think this is going to require additions to the following file:
https://github.com/coin-or/CppAD/blob/master/include/cppad/example/cppad_eigen.hpp

The easiest cases to do in general are probably those that are already in the CppAD::numeric_limits; see
https://coin-or.github.io/CppAD/doc/numeric_limits.htm.

To extend this to any base type one would have to add to the base type requirements; see
https://coin-or.github.io/CppAD/doc/base_limits.htm

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@bradbell OK, I made a PR which fixes this issue for me, and did my best to add suitable test cases; all tests pass on my machine.

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