ecld.mgf_term: The term structure of ecld symmetric MGF
Description
ecld.mgf_term and ecld.mgf_diterm are the term and derivative
of the term by order (n) in the summation of MGF.
ecld.mgf_trunc uses ecld.mgf_diterm to locate the truncation
of MGF terms.
ecld.mgf_trunc_max_sigma locates the maximum sigma that keeps MGF finite for each lambda.
SGED is supported.