Ftw.solr

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- Nothing changed yet.

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- Fix becoming the system user in zopectl command in Docker deployments.
[buchi]

- Fix finding Plone sites in zopectl command in Docker deployments.
[buchi]

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- Fix argument parsing of zopectl command if run with Zope2.Startup.zopectl.
[buchi]

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- Log warning when a search is performed without specifying fl.
[njohner]

- Fix solr sync maintenance command not committing all batches.
[lgraf]

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- Add support for Plone 5.2 and Python 3.
[buchi]

- Add Python 3.8 and up compatibility.
[mathias.leimgruber]

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- Make updates_in_post_commit_enabled() helper more robust. [lgraf]