missing boost header <boost/random/non_central_chi_squared_distribution.hpp>

[Peter]

The header file is available in boost-1.59 but missing in boost-1.55.

We only use this header to typedef

typedef
ContinuousDistribution<boost::random::non_central_chi_squared_distribution<> >
NonCentralChiSquared;

so a sensible solution seems to to exclude this typedef when header is not available.

[Peter]

In 3900:

closes #944; add configure check whether class is availabale in boost and exclude typedef if not. Lift out test for that typedef to separate test so it can be skipped (without skipping all sister tests) when boost is old.

[Peter]

In 3912:

boost random classes beta_distribution, hyperexponential_distribution
and laplace_distribution are not available with boost 1.53. Similar to
non_central_chi_squared (refs #944) these classes are only used in a
typedef, so we exclude these typedefs when the classes were not found
in configure. Lifting out tests of these classes to their own tests,
so these tests can return SKIP.