[v3] Start random dists values testing

[Paolo Carlini]

Hi,

the below is a start on the long overdue task of checking the values 
produces by the random distributions. For the time being I'm simply 
adapting rather elementary code in GSL, already good enough to enable 
regression tests for libstdc++/48114.

I expect that testing along similar lines the other discrete 
distributions will be pretty straightforward; for the continuous ones 
we'll need an integration routine (I hope something simpler than 
gsl_integration_qags will be enough).

Tested x86_64-linux, committed to mainline.

Paolo.

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