Create publishable data

[korenmiklos]

Clean .csv files with good variable names.
exporter, importer, year, kullback_leibler_divergence, trade_similarity_index.
Maybe separate fields for 4- and 6-digit calculations.
Keep this as a bead, saving code, too. Short clean README.

[korenmiklos]

Sample below

declarant,partner,flow,year,kullback_leibler_divergence,trade_similarity_index
DE,RU,export,2014,0.632,0.924,

[korenmiklos]

THETA = 8.0
df['trade_similarity_index'] = pd.np.exp(-1/THETA * data['kullback_leibler_divergence'])