cdfs now available

[Brian Gough]

I have added a large number of cumulative distribution functions and
their inverses to cvs on sources.redhat.com.  Thanks to Jason H Stover
for his work on the major distributions over the past months.  This
fills a long-standing gap in the library.  I added some of the other
distribution functions and the test-suite.

Currently there is one unimplemented inverse cumulative distribution
function (beta/F-distribution).

bjg|debian> ls gsl/cdf/
CVS/	     cauchyinv.c       gammainv.c    laplaceinv.c    rayleighinv.c
ChangeLog    chisq.c	       gauss.c	     logistic.c      tdist.c
Makefile     chisqinv.c        gaussinv.c    logisticinv.c   tdistinv.c
Makefile.am  exponential.c     gsl_cdf.h     lognormal.c     test.c
Makefile.in  exponentialinv.c  gumbel1.c     lognormalinv.c  testgen.c
beta.c	     fdist.c	       gumbel1inv.c  pareto.c	     testint.c
beta_inc.c   flat.c	       gumbel2.c     paretoinv.c     weibull.c
bughunt.pl   flatinv.c	       gumbel2inv.c  rat_eval.h      weibullinv.c
cauchy.c     gamma.c	       laplace.c     rayleigh.c

-- 
Brian