3em dash support in references #1012
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Chicago reference style has this awful usage of 3em dash to repeat one or several, or all, authors of the previous reference. Although this practice seems to be removed or restricted by the the latest Chicago style guidelines, latex for instance still work with older guidelines and there are tons of back files with this style.
This PR tries to cover 3em dash in references (some training data for this has been added separately), when each three 3em dash sequence refers to one author. The case with one 3em dash sequence used to refer to all the previous authors is not covered, because it seems ambiguous with the case the first author is repeated.
However the real main problems with this crappy mechanism are with OCR, in particular older OCRized PDF. These dashes are never correctly recognized and the reconstruction of the author list becomes just impossible.
Some example:
With numbers:
And finally three 3em dash to repeat all the authors of the previous reference (not just the first!).