Add different classes to hocr output depending on BlockType #2432
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These classes are taken from the hOCR specification, and seem
to map well onto the BlockType types. There are probably more that
could be added.
Note that I haven't read the hOCR specification closely, so there's a
chance I misunderstood something. @kba, can you take a look and
check that the hOCR produced is valid and sensible?