Check consequences of R_star sampling on p_SE. Need to optimize this check.

Also, set seed manually. Need to pass seed control to R.
Also, change beta prior precision. Need to pass prior beta control to R.
Store p_se pointer in FC_R_Star
Pass random seed up to Rcpp level, not yet exposed to R. Update R documentation.
pass beta prior control up to Rcpp. Think about combining this approach with gamma prior control
Remove unneccesary sampling debug code, add check for probable failure (starting at -Inf)