Pypicloud

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* Python3 support thanks to boto3
* Removing stable/unstable version from package summary
* Changing and removing many settings
* Performance tweaks
* ``graceful_reload`` option for caches, to refresh from the storage backend while remaining operational
* Complete rewrite of LDAP access backend
* Utilities for hooking into :ref:`S3 create & delete notifications <s3_sync>` to keep multiple caches in sync

**NOTE** Because of the boto3 rewrite, many settings have changed. You will need
to review the settings for your storage, cache, and access backends to make sure
they are correct, as well as rebuilding your cache as per usual.

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* Add ``storage.object_acl`` for S3 (:pr:`139`)

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* Allow search endpoint to have a trailing slash (:issue:`133`)

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* Allow overriding the displayed download URL in the web interface (:pr:`125`)
* Bump up the DB size of the version field (SQL-only) (:pr:`128`)

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* Bug fix: S3 uploads failing from web interface and when fallback=cache (:issue:`120`)

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* Bug fix: The ``/pypi`` path was broken for viewing & uploading packages (:issue:`119`)
* Update docs to recommend ``/simple`` as the install/upload URL
* Beaker session sets ``invalidate_corrupt = true`` by default