Parallelize nanopolish eventalign

[matthewstuartedwards]

Description of feature

The author of nanopolish has said that the recommended way to parallelize it is to split up the fastq files, then join the output files together.

jts/nanopolish#770

nanoseq could operate on multiple fastq files in the input directory, and execute nanopolish event align in parallel.

I know xpore and m6anet operate using a single fastq file, so the input files will need to be concatenated for that step, but parallelizing nanopolish would speed up the overall operations of the pipeline.

Alternatively, if a single large fastq file is provided, nanoseq could split that file into chunks before running nanopolish event align.