Beta-binomial second-order derivative with respect to its pi parameter (twice); for internal use by C++, accounting for numerical precision problems via increased memory usage (number of bits per number)

Beta-binomial second-order derivative with respect to its pi parameter (twice); for internal use by C++, accounting for numerical precision problems via increased memory usage (number of bits per number)

GradPiPi_cppi_MP(M, N, PI, THETA, NecPres)