Pypicloud

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* Bug fix: Deleting packages while using the Dynamo cache would sometimes remove the wrong package from Dynamo (:issue:`118`)

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**Upgrade breaks**: SQL caching database. You will need to rebuild it.

* Feature: Pip search works now (:pr:`107`)

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* Bug fix: Deleting packages while using the Dynamo cache would sometimes remove the wrong package from Dynamo (:issue:`118`)

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* Bug fix: Access backend now works with MySQL family (:pr:`106`)
* Bug fix: Return http 409 for duplicate upload to work better with twine (:issue:`112`)
* Bug fix: Show upload button in interface if ``default_write = everyone``
* Confirm prompt before deleting a user or group in the admin interface
* Do some basica sanity checking of username/password inputs

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* Feature: Add optional AWS S3 Server Side Encryption option (:pr:`99`)

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* Bug fix: Rebuilding cache always ends up with correct name/version (:pr:`93`)
* Feature: /health endpoint (nothing fancy, just returns 200) (:issue:`95`)