Missing tests
=============
* for non-ASCII filenames
* for Cuneiform hOCR with inline formatting
* for Cuneiform hOCR with bounding boxes for whitespace characters
* for Cuneiform hOCR with empty pages
* for OCRad, in particular:
  - for non-ASCII characters
  - for text close to a page boundary
  - for empty pages
  - for characters with no interpretations
* for GOCR, in particular
  - for non-ASCII characters
  - for empty pages
* for https://bugs.debian.org/575484#35
* for https://bugs.debian.org/671764
* for https://bitbucket.org/jwilk/ocrodjvu/issue/4
* for https://bitbucket.org/jwilk/ocrodjvu/issue/12

Documentation
=============
* write better documentation for -X

Nice-to-have things
===================
* support for OCRopus 0.5
* ``--debug`` should enable debug logging
* https://bugs.debian.org/575490

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