Minor release

Following minor additions:

• Reporting the number of input reads failing mean base quality filtering (and optionally saving them to fastq).
• Reporting the number of output fragments failing minimum length filtering (and optionally saving them to fastq).
• Filter out reads with invalid quality strings.
• Saving the counts for all primer configurations to the stats TSV.
• Reporting potential artefactual primer configurations.
• Checking for sufficient hmmer version.