Cosmetics
Small SetScaleFactor optimization

Do not re-render the PDF we set the scale factor to the current
value.
Added more document templates

Now we have all the page formats needed for parsing the IBGE map data
of the city of Para de Minas. :)
Another attempt to make exception handling more readable

Catch the exception on the spot when for some reason the OCR don't
recognize the coordinates properly.
Trying to get the scale factor right this time

Apparently 3 works for most of the documents. I ran some tests on the
Para de Minas data set and only a few PDFs need to go further.

I don't quite get yet why Tesseract sometimes doesn't manage to
recognize an coordinate even though the text looks sharp to me.
Fix the magic offset mess

Now it looks less magic. All the PDFs from Para de Minas are apperently
being recognized correctly.
Reduce the coordinates per pixel ratio threshold

Apparently I was a way too optimistic.