Cleanup and better error-handling.
Avoid unnesseary seek operation.
Adding functions to identify FASTQ quality offsets.
Adding functions to do random sampling.
Verify choice of quality score offset before trimming reads.
Fix use of wrong func-name, improve error-handling.
Ensure that step is an integer.
Add a few additional tests, in case the use of mixins changes.
Always kill process, to prevent inf. waits.
Merge branch 'master' of github.com:MikkelSchubert/pypeline
Fixes use of multiple homozygous chromosomes.
A couple of reminders / improved exception msg.
Fix a couple of minor issues in code used to generate example data.
Fix mistake in example data (wrong header prefix for R2 files).
Further checks for input FASTQ files.