Conversion to DSL2 & update of tools

[d4straub]

All nf-core pipelines will be converted to nextflow DSL2 and nf-core/bacass should not be left behind.
Additionally, this opportunity can be used to update all tools and progressively add more.

Currently, I am planning to go into that middle of September 21 at the latest. Earliest start would be when nf-core/tools releases its DSL2 template, which might be soon.

I'll write here as soon as I start. If anybody else is planning to or is tackling that problem already, please share your plans here that there is no redundant work done.

Edit: #54 with support for DSL2 is open

[d4straub]

Ok, I start now with template update 2.1 #55 and DSL2 conversion.

[d4straub]

Alright, thats done.