Added somatic cnvkit

[SusiJo]

PR checklist

• This comment contains a description of changes (with reason).
• If you've fixed a bug or added code that should be tested, add tests!
  • If you've added a new tool - add to the software_versions process and a regex to scrape_software_versions.py
  • If you've added a new tool - have you followed the pipeline conventions in the contribution docs
  • If necessary, also make a PR on the nf-core/sarek branch on the nf-core/test-datasets repository.
• Make sure your code lints (nf-core lint .).
• Ensure the test suite passes (nextflow run . -profile test,docker).
• Usage Documentation in docs/usage.md is updated.
• Output Documentation in docs/output.md is updated.
• CHANGELOG.md is updated.
• README.md is updated (including new tool citations and authors/contributors).

[lassefolkersen]

Hi @SusiJo nice work! I couldn't get it to run in full, I mean the whole Sarek from fastq with this commit, but that's because I'm a little behind on having a test-bench for the latest of the latest. I'll work with that over the next few days. But don't let that hold you back, I think this somatic setup is absolutely what is needed and as far as I can tell from the code it looks solid what you've made.

[SusiJo]

I adjusted the order in the modules.config and moved the cnvkit-tumoronly stuff to the tumor-variant-calling section