PR for 2.3 release

[jfy133]

This PR is for 2.3 - "Aalen".

It includes a couple of minor bug fixes, and also additional functionality request by reviewers of the nf-core manuscript.

Functionality includes

• Low-sequence complexity read filtering prior metagenomic screening
• mapDamage rescaling of BAM files

Fixed issues

• DeDup nullPointerException fix (version bump)
• Fixed AWS stress test a bit more
• Fixed some mistakes in schema regarding dropdowns
• Fixed a (semi-)major bug where filtering options using circularmapper was flipped

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/eager 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).

[maxulysse]

Looks good to me ;-)

[apeltzer]

LGTM :-)