synth5k.xml is generated from subreads.fasta using fasta2bam, which uses
some old lamdbda bam as a template. subreads.fasta is circularly sampled as error-free reads
from ref.fasta, which is a 5000-base random genome.

subreads.dexta is from thegenemyers/DEXTRACTOR on subreads.fasta, so subreads.fasta can be recovered
using undexta.

fasta2bam adds tags for both Quiver and Arrow, so it should work with either.
