break up (or augment) LTpairs into chunks of size reps

This is a weird little function that lets us break up the LTpairs that will be used for the miss_mask_mats in the Snakemake missing-data simulation workflow. The idea is that we can get extra parellelization and keep the memory overhead for each job down low by restricting the number of reps done. If the names of the LTPairs list are like c("120", "121",...), the the new names will be like c("120_1", "120_2", "120_3", 121_1", "121_2", etc...)

break_up_LTpairs(L, R)

Arguments

L

a list with elements that are the LT_pairs. Each element is a list with elements r and c.

R

the number of reps desired. Should typically be about 50,000 to make the memory footprint of each simulation manageable.