functions related to the Hurwitz zeta function

[Jerome BENOIT]

Greetings,

I have write within the GSL framework,
some functions related to the Hurwitz zeta function:
first and second derivatives, its logarithm  and its logarithmic derivative.

These functions are needed to fit properly discrete power law distributions [1].

I think that there is a place for them  (along a plfit material) in GSL:
what is the procedure to follow ton bring them in GSL  ?


Best regards,
Jerome


[1]
@ARTICLE{AClausetCRShaliziMEJNewman2009,
        author   = {Aaron Clauset and Cosma Rohilla Shalizi and Mark E. J. 
Newman},
        title    = {Power-Law Distributions in Empirical Data},
        journal  = "SIAM Rev.",
        year     = {2009},
        volume   = {51},
        number   = {4},
        pages    = {661--703},
        numpages = {43},
        archivePrefix = ARXIV,
        eprint   = {0706.1062},
        doi      = {10.1137/070710111},
        website  = {http://tuvalu.santafe.edu/~aaronc/powerlaws/},
}