I'm thinking about doing a little refactoring of cluster_within. I'd like to create an assemble/util.py for functions that have common use across different steps, such as comp(). I also want to include the vsearch derep and sort calls in the util.py. I need to do some of the same things in refmap as in cluster_within. Duplicating code (which is waht i'm doing now) is a bad practice, so i want to abstract away all the stuff that has to happen multiple places and chuck it in just one file, that way if we need to change a flag to vsearch or whatever you only have to do it one place.