Add GMM-Demux

[mari-ga]

PR checklist

Closes #XXX

• [ ] 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 - 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 versions.yml 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:
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  • [x] nf-core modules test <MODULE> --profile docker
  • [ ] nf-core modules test <MODULE> --profile singularity
  • [x] nf-core modules test <MODULE> --profile conda
  • For subworkflows:
  • [ ] nf-core subworkflows test <SUBWORKFLOW> --profile docker
  • [ ] nf-core subworkflows test <SUBWORKFLOW> --profile singularity
  • [ ] nf-core subworkflows test <SUBWORKFLOW> --profile conda

[SPPearce]

The tool seems to work fine without specifying any of the optional outputs, can we just test that without the additional config?

[SPPearce]

Currently the prefix is only used in the summary_report_${prefix}.txt file (which should probably be ${prefix}_summary_report.txt). Do we want to rename the output files with ${prefix}?

[mari-ga]

I added one simple test without nextflow.config, please let me know if it's correct