inclusion of gzip import in guppyplex target

[sagrudd]

We have users with gzipped fastq from guppy base-calling; this import fixes the workflow and will accommodate the aggregation of gzipped fastq files

[sagrudd]

Trivial update included - in the code for iterating through fastq entries in guppyplex there was a slice to exclude the last fastq file within the list (am I missing something clever here?) - this means that if working with e.g. SRA / ENA monolithic datasets that the pipeline fails because the read collection will only ever be 0 reads in length

[nickloman]

Thanks - merged, although artic guppyplex would not be the way to deal with monolithic datasets.