is removed because it is not used, and anyway the name of this
  parameter is not good
* review code of getRemainingTradePhaseList in order to match API,
  we do not take into account an "explanation" argument any more
* update unit tests in order to test what the API describe. Also
  simplify unit test

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@44376 20353a03-c40f-0410-a6d1-a30d3c3de9de