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

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