Flask-iiif

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- Sets Redis cache prefix
- Fixes cache control headers

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- Fixes syntax error in documentation
- Fixes import sorting

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+ Fixes

- wrong ratio calculation for best fit

+ New features

- adds black background to requested best fit thumbnail or gif
if the image does not cover the whole window of requested size

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- Fixes unicode filename issues.

- Changes default resampling algorithm to BICUBIC for better image quality.

- Adds support for _external, _scheme etc parameters for iiif_image_url.

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+ Security

- Fixed missing API protection on image metadata endpoint.

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- Deployment changes.