dstats alpha 4

[Don]

dsimcha wrote:
> The latest alpha of my statistics library is out on Scrapple.  I've decided
> that it needed a catchier name, so I've renamed it to dstats.  Anyhow, it's
> undergone some pretty drastic upgrades since the last time I announced a
> release.  We now have the following relatively major stuff that wasn't there
> before, plus some minor stuff that I forgot to mention.
> 
> Much improved docs.
> 
> Much better API organization.
> 
> A decent information theory module, with entropy, mutual information, joint
> entropy and conditional mutual information.
> 
> Mean, variance, standard deviation, skewness, kurtosis, Pearson correlation
> and covariance can now be calculated online as data is received, or from arrays.
> 
> Improved memory allocation for scratch space used within functions by using
> the TempAlloc region allocator.
> 
> A combination generator that can generate all (N choose R) combinations from a
> sequence.
> 
> Equal frequency and equal width binning functions.
> 
> Laplace and Cauchy CDFs and inverse CDFs
> 
> Student's one- and two-sample and Welch's T-tests.
> 
> The Waltz-Wolfowitz test for randomness of a sequence.
> 
> Random number generation from the normal, Cauchy, Laplace, Bernoulli,
> binomial, and hypergeometric distributions.
> 
> Lots of bug fixes and performance improvements.
> 
> Unfortunately, D1 doesn't have enough features for me to create the API I want
> in dstats, so I've been targeting the bleeding edge compilers.  dstats will
> only work on DMD 2.022.  Even with 2.021, the TLS GC bug that was fixed in
> 2.022 will break it.

Looks great!
Could you please review the new 'math.random' package in Tango? I hate 
competition, would be great if we could take the best of both.