Nf core v2.1

[bunop]

PR checklist

Closes #2

• [ ] This comment contains a description of changes (with reason).
• [ ] If you've fixed a bug or added code that should be tested, add tests!
• [x] If you've added a new tool - have you followed the module conventions in the contribution docs
• [x] If necessary, include test data in your PR.
• [x] Remove all TODO statements.
• [x] Emit the <SOFTWARE>.version.txt file.
• [x] Follow the naming conventions.
• [x] Follow the parameters requirements.
• [x] Follow the input/output options guidelines.
• [x] Add a resource label
• [x] Use BioConda and BioContainers if possible to fulfil software requirements.
• Ensure that the test works with either Docker / Singularity. Conda CI tests can be quite flaky:
  • [x] PROFILE=docker pytest --tag <MODULE> --symlink --keep-workflow-wd
  • [ ] PROFILE=singularity pytest --tag <MODULE> --symlink --keep-workflow-wd
  • [ ] PROFILE=conda pytest --tag <MODULE> --symlink --keep-workflow-wd