* both Transformation and TransformedResource should support a context
  passing a multiple quantity. The proper way to do so is to deleguate
  quantity computation to Transformation Lines, and then to pull the result
  up to aggregate it in Transformations.
* Fix a quirk in TransformationRule that was induced by the wrong
  behaviour of TransformedResource.getAggregatedAmountList: noone should
  need to multiply the amounts returned by getAggregatedAmountList, as
  the method should already include the computed quantities.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@33830 20353a03-c40f-0410-a6d1-a30d3c3de9de