Lineage-registry

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- Nothing changed yet.

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- update for Plone 5.2 and Python 3, add PyPI classifiers
[tkimnguyen]

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- Uninstall added. Attention: Uninstall deletes local registry!
[jensens]

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- Fix: Return keys sorted, because ``RecordsProxyCollection`` expects them ordered.
One effect fixed is that resoruce bundles in subsites are not delivered 11 to 10 times.
[jensens]

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- Add profile to properly register the upgrade step.
[thet]

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- Fix Database Conflict Errors, due to missing ``__parent__`` parameter on the
LineageRegistry object, which led to writing it on each request. An upgrade
step is provided. Please note, the upgrade step is bound to the
``collective.lineage`` profile, as we don't have a profile in here.
[thet]