[SUGGESTION] Migration to Nextflow Version 20.04.1

[dweemx]

Is your feature request related to a problem? Please describe.
No.
Migration to Nextflow Version 20.04.0

Describe the solution you'd like

• Improve path manipulation: nextflow-io/nextflow@7832a69 (will be considered later)
• Improve module imports: nextflow-io/nextflow@a9ae36f

include { foo; foo as bar } from "$MODULE"

• Fixes issue with singularity where the spawned processes are not killed
• nextflow config works from remote locations => no need for an explicit nextflow pull

Describe alternatives you've considered
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Additional context
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