conflict of library names for tecnical replicates

[ChristopherBarrington]

Description of the bug

Technical replicates must have different FastQ file names for the pipeline to work. In my case the same pool of libraries was sequenced on two flow cells and had the exact same file names. The pipeline then tries to cat the files together (I think this was the step that failed) but nextflow can't produce the symlinks in the work directory because the multiple files have the same file name.

In the meantime I have changed the file name of the FastQ so that I have _00{1,2}.fastq.gz to distinguish the flow cells on which the libraries were sequenced and the pipeline seems happy with that.

[drpatelh]

Will be fixed when the changes here are merged and re-installed into the pipeline nf-core/modules#1107