Itsxpress

Fixed the interleaved problem.

Fix for issue validating fastq.gz files

Fixed issue validating fastq.gz and added tests.

This release fixes an error that occasionally occurred when validating FASTQ files. ITSxpress used BBtools reformat.sh which occasionally threw an exception when validating FASTQ files due to a race condition. FASTQ file validation is now done with Biopython instead.

Changed the default clustering identity to 99.5% for increased accuracy.

* Versioning is now tied to the versioning of ITSxpress
* This release adds a new feature to cluster merged sequences at less than 100% identity. This speeds up typical dataset trimming by about 10x over previous versions depending on the sample, without major effects on trimming accuracy. This feature is controlled with the --cluster_id flag. Default behavior is now to cluster at 0.987 identity.