bug in gsl_ran_chisq_pdf

[keith dot briggs at bt dot com]

In gsl-1.3, gsl_ran_chisq_pdf(0.0,nu) is wrong.

It returns 0.0 whatever nu is.

It should return Inf for nu=1.
It should return 0.5 for nu=2.
It should return 0.0 for nu>2.

Keith

	Dr. Keith M. Briggs
	Senior Mathematician, Complexity Research, BTexact.
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