Calculate the parameters of the log-Normal that best approximates the given Gamma distribution. The approximation is the best in the sense that it minimizes the KL divergence from the Gamma to the log-Normal
convert_Normal_Poisson(conj.param, parms)The parameters of the Normal distribution of the linear predictor.
list: A vector containing the parameters of the Gamma (alpha,beta).
list: A list of extra known parameters of the distribution. Not used in this kernel.
Other auxiliary functions for a Poisson outcome:
convert_Poisson_Normal(),
poisson_pred(),
update_Poisson()