optimize_n: Optimize the n parameter during denovo stacks assembly
Description
This function requires the path to stacks vcf file(s) as input.
There are slots for varying the n parameter across M-1, M, and M-1 (as recommended by Paris et al. 2017).
After running stacks with each of the n options, plug the output vcf files into this
function to visualize the effect of varying m on number of SNPs and loci built to
recognize which value optimizes the n parameter for your dataset at the 'R80' cutoff (Paris et al. 2017).