Define DSL1 explicitly, as Nextflow made DSL2 default

[Lehmann-Fabian]

Signed-off-by: Lehmann_Fabian fabian.lehmann@informatik.hu-berlin.de

Cannot start DSL1 workflows with the newest Nextflow version. So I had to define the DSL version explicitly.

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[jfy133]

Thanks @Lehmann-Fabian ! I'm just going to do a quick local test what happens when you run this but with earlier versions of NXF and then merge

[jfy133]

Ah, please update changelog then we are good to go - works OK on my tests! :)

[Lehmann-Fabian]

Thanks a lot for your review. I updated the changelog accordingly.

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