New samples in test split

The description of the error typology has been brought into line with the actual contents of the error_type field

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New samples added

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removing old test split

Splitting dataset to train and test; adding synthetic train data

Updating statistics

Additional samples (poetry) added; fixed_text initialized for majority of samples

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Poetry samples added

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Fixing typos in readme

Fixing "id" field content

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Initial version of dataset

initial commit