Update of the prior estimate in EM algo parallelized version
prior_update_arma_ptr_parallel(
Hconfig,
fHconfig_sum,
OldPrior,
Logf0Mat,
Logf1Mat,
threads_nb = 0L
)a double vector containing the new estimate of prior w_c
list of vector of 0 and 1, corresponding to the configurations
a double vector containing sum_c(w_c*psi_c), obtained by fHconfig_sum_update_ptr_parallel()
a double vector containing the prior w_c
a double matrix containing the log(f0(xi_q))
a double matrix containing the log(f1(xi_q))
an int the number of threads