Invenio-classifier

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Bug fixes
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- Prevent the "unprintable KeyError" problem from happening.

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Bug fixes
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- Reverse sort core keywords.

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Incompatible changes
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- Exports list of objects rather than list of tuples, to help ES
directly indexing the content.

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Incompatible changes
~~~~~~~~~~~~~~~~~~~~

- Do not use keywords as dictionary keys, rather as elements in a list.

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Bug fixes
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- Supports '·' author separator
- Support utf8 author-keywords

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Bug fixes
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- Enforce utf8 also for non PDF files in extractor.