EDocument UNECE Module
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The module adds many codes from the UNECE:
* `Recommendation N°. 20 Codes for Units of Measure Used in International
Trade
<http://www.unece.org/tradewelcome/un-centre-for-trade-facilitation-and-e-business-uncefact/outputs/cefactrecommendationsrec-index/list-of-trade-facilitation-recommendations-n-16-to-20.html>`_
* `5153 Duty or tax or fee type name code
<http://www.unece.org/trade/untdid/d16b/tred/tred5153.htm>`_
* `5305 Duty or tax or fee category code from
<http://www.unece.org/trade/untdid/d16b/tred/tred5305.htm>`_
