Tryton application platform - edocument unece module

 Tryton is a high-level general purpose application platform. It is the base
 of a complete business solution as well as a comprehensive health and hospital
 information system (GNUHealth).
 .
 This module adds many codes from the United Nations Economic Commission for
 Europe (UNECE):
 .
  * Recommendation N°. 20 Codes for Units of Measure Used in International Trade
    <https://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
    <https://www.unece.org/trade/untdid/d16b/tred/tred5153.htm>
 .
  * 5305 Duty or tax or fee category code from
    <https://www.unece.org/trade/untdid/d16b/tred/tred5305.htm>