- NodeBudgetVariation that explicitly lists the possible values one by one,
either by selecting them of specifying a script to return this list of
values
- CategoryBudgetVariation that uses a base category
for each one, you specify what will be the "axis" used for getInventory (node,
mirror_node, node_category etc)

"SectionCategoryBudgetVariation" is therefore useless, it's a
CategoryBudgetVariation where the axis is "section_category"

Budget Cell, Budget Line and now Budget itself can be variated

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@25614 20353a03-c40f-0410-a6d1-a30d3c3de9de