Fix layout detection algorithm

...oise-ocr4-twopass-google-lowres.00.accuracy-results-hires

...s-google-lowres.00.accuracy-results-hires.difficult-pages

...oise-ocr4-twopass-google-lowres.00.accuracy-results-human

...pass-google-lowres.00.accuracy-results-human-with-columns

...es.00.accuracy-results-human-with-columns.difficult-pages

...s-google-lowres.00.accuracy-results-human-without-columns

...00.accuracy-results-human-without-columns.difficult-pages

...s-google-lowres.00.accuracy-results-human.difficult-pages

...ise-ocr4-twopass-google-lowres.00.accuracy-results-lowres

...-google-lowres.00.accuracy-results-lowres.difficult-pages

scripts/common.py