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 http://bugs.debian.org/575484#35

Documentation
=============
* Write better documentation for -X.

Nice-to-have things
===================
http://bugs.debian.org/575490

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