Flatten Giusti et al. frame folder structure

Usage: giusti-flatten.py <in_dir> <out_dir> <metadata_file>

in_dir: folder with data from https://people.idsia.ch/~guzzi/DataSet.html
out_dir: the directory to put all frames that will be named like "00072811.jpg"
metadata_file: file to store correlation between input paths and output frame numbers

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