Allow images with up to 40k by 40k pixels, fix #735 #768
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This limit is pretty arbitrary but I have not come across any image even close to this large and it would be enough to handle the 2559x37192 image mentioned in tesseract-ocr/tesseract#3184 - though
ocrd-tesserocr-recognize
would still fail currently because the MAX_IMAGE_PIXELS change here only relates to the Python API, not the tesseract API.