v2.2

[NastyBoget]

• PdfTabbyReader improved: bugs fixes, speed increase of partial PDF extraction (with parameter pages).
• Added benchmarks for evaluation of PDF readers performance.
• Added ReferenceAnnotation class.
• Fixed bug in can_read method for all readers.
• Added article structure type for parsing scientific articles using GROBID (ArticleReader, ArticleStructureExtractor).

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This discussion was created from the release v2.2.