Parallelize fastq transformation.
Parallelize fastq transformation.

On my laptop with 1 core, 1 million reads:

real	0m37.614s
user	0m35.506s
sys	0m1.313s

2 cores:

real	0m22.627s
user	0m35.284s
sys	0m1.547s

vals/umis,vals/umis,roryk/umis,roryk/umis