Patch to define GSL_SF_FACT_NMAX and GSL_SF_DOUBLEFACT_NMAX

[Jonathan G. Underwood]

Hi

The attached patch exports the following two macros:

GSL_SF_FACT_NMAX
GSL_SF_DOUBLEFACT_NMAX

which define the maximum values of n such that gsl_sf_fact(n) and
gsl_sf_doublefact(n) do not over flow. Macros were internally defined
for this previously, but not exported or exported or named consistently
with other macros. Since gsl has the equivalent GSL_SF_GAMMA_XMAX for 
gsl_sf_gamma, I think we should define these macros as they are useful 
from a user perspective, and it makes for consistency for the functions 
related to the gamma function. Also, this patch adds an #undef 
LogRootTwoPi_ for gamma.c, as it was never meant to be exported 
(cosmetic). The patch also documents the changes.

Jonathan.

-- 
------------------------------------------------
Dr Jonathan Underwood

The Department of Physics and Astronomy
The Open University
Walton Hall
Milton Keynes
MK7 6AA
UK

Tel: +44 (0) 1908 652514
Fax: +44 (0) 1908 654192
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