The Jacobian Elliptic functions are defined in Abramowitz & Stegun,
Chapter 16. The functions are declared in the header file
``gsl_sf_elljac.h'`.

__Function:__int**gsl_sf_elljac_e***(double*`u`, double`m`, double *`sn`, double *`cn`, double *`dn`)- This function computes the Jacobian elliptic functions @math{sn(u|m)}, @math{cn(u|m)}, @math{dn(u|m)} by descending Landen transformations.

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