use phylogenetic placement output in qiime

[d4straub]

Closes https://github.com/nf-core/ampliseq/issues/561

Taxonomic tree and taxonomic annotation from phylogenetic placement are now picked up and used in downstream (QIIME2) analysis.

The additional code in FORMAT_PPLACETAX uses only the taxonomic annotation from Gappa that

- has the lowest LWR, 
- if multiple, 
     - if identical it will choose the first one, 
     - if not identical, it will choose the one with less taxonomic entries, 
               - if same number of taxonomic entries, it will remove entries until they are identical, 
               - if all removed it will add a `NA`. 

I searched, tested and dismissed several pre-made code/commands/functions for this, such as from R's stringi or stringr packages, so I made the custom code.

PR checklist

• [x] This comment contains a description of changes (with reason).
• [x] 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 pipeline conventions in the contribution docs- [ ] If necessary, also make a PR on the nf-core/ampliseq branch on the nf-core/test-datasets repository.
• [x] Make sure your code lints (nf-core lint).
• [x] Ensure the test suite passes (nextflow run . -profile test,docker --outdir <OUTDIR>).
• [ ] Usage Documentation in docs/usage.md is updated.
• [x] Output Documentation in docs/output.md is updated.
• [x] CHANGELOG.md is updated.
• [x] README.md is updated (including new tool citations and authors/contributors).

[github-actions[bot]]

nf-core lint overall result: Passed :white_check_mark: :warning:

Posted for pipeline commit e112d39

+| ✅ 155 tests passed       |+
#| ❔   1 tests were ignored |#
!| ❗   2 tests had warnings |!

### :heavy_exclamation_mark: Test warnings: * [readme](https://nf-co.re/tools-docs/lint_tests/readme.html) - README did not have a Nextflow minimum version badge. * [schema_lint](https://nf-co.re/tools-docs/lint_tests/schema_lint.html) - Parameter `input` is not defined in the correct subschema (input_output_options) ### :grey_question: Tests ignored: * [files_exist](https://nf-co.re/tools-docs/lint_tests/files_exist.html) - File is ignored: `conf/igenomes.config` ### :white_check_mark: Tests passed: * [files_exist](https://nf-co.re/tools-docs/lint_tests/files_exist.html) - File found: `.gitattributes` * [files_exist](https://nf-co.re/tools-docs/lint_tests/files_exist.html) - File found: `.gitignore` * [files_exist](https://nf-co.re/tools-docs/lint_tests/files_exist.html) - File found: `.nf-core.yml` * [files_exist](https://nf-co.re/tools-docs/lint_tests/files_exist.html) - File found: `.editorconfig` * [files_exist](https://nf-co.re/tools-docs/lint_tests/files_exist.html) - File found: `.prettierignore` * [files_exist](https://nf-co.re/tools-docs/lint_tests/files_exist.html) - 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Config ``dag.enabled`` had correct value: ``true`` * [nextflow_config](https://nf-co.re/tools-docs/lint_tests/nextflow_config.html) - Config ``manifest.name`` began with ``nf-core/`` * [nextflow_config](https://nf-co.re/tools-docs/lint_tests/nextflow_config.html) - Config variable ``manifest.homePage`` began with https://github.com/nf-core/ * [nextflow_config](https://nf-co.re/tools-docs/lint_tests/nextflow_config.html) - Config ``dag.file`` ended with ``.html`` * [nextflow_config](https://nf-co.re/tools-docs/lint_tests/nextflow_config.html) - Config variable ``manifest.nextflowVersion`` started with >= or !>= * [nextflow_config](https://nf-co.re/tools-docs/lint_tests/nextflow_config.html) - Config ``manifest.version`` ends in ``dev``: ``'2.6.0dev'`` * [nextflow_config](https://nf-co.re/tools-docs/lint_tests/nextflow_config.html) - Config `params.custom_config_version` is set to `master` * [nextflow_config](https://nf-co.re/tools-docs/lint_tests/nextflow_config.html) - Config `params.custom_config_base` is set to `https://raw.githubusercontent.com/nf-core/configs/master` * [nextflow_config](https://nf-co.re/tools-docs/lint_tests/nextflow_config.html) - 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`assets/sendmail_template.txt` matches the template * [files_unchanged](https://nf-co.re/tools-docs/lint_tests/files_unchanged.html) - `assets/nf-core-ampliseq_logo_light.png` matches the template * [files_unchanged](https://nf-co.re/tools-docs/lint_tests/files_unchanged.html) - `docs/images/nf-core-ampliseq_logo_light.png` matches the template * [files_unchanged](https://nf-co.re/tools-docs/lint_tests/files_unchanged.html) - `docs/images/nf-core-ampliseq_logo_dark.png` matches the template * [files_unchanged](https://nf-co.re/tools-docs/lint_tests/files_unchanged.html) - `docs/README.md` matches the template * [files_unchanged](https://nf-co.re/tools-docs/lint_tests/files_unchanged.html) - `lib/nfcore_external_java_deps.jar` matches the template * [files_unchanged](https://nf-co.re/tools-docs/lint_tests/files_unchanged.html) - `lib/NfcoreSchema.groovy` matches the template * [files_unchanged](https://nf-co.re/tools-docs/lint_tests/files_unchanged.html) - `lib/NfcoreTemplate.groovy` matches the template * [files_unchanged](https://nf-co.re/tools-docs/lint_tests/files_unchanged.html) - 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README Nextflow minimum version in Quick Start section matched config. 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