As a matter of fact immediateReindexObject doesn't call reindexObject on the object

SimulationTool: getNextAlertInventoryDate can look for the lowest invetory inferior to the reference quantity

Since last FormBox behavior fix, the context needs to have View permission.
We allow to View for groups that has some permissions on the related delivery.
This way, users that has permission to solve divergences should be able
to get the form, fill it, update it and submit it.

generateMovementListForStockOptimisation was raising error when there was inventories.
The method was assuming that doing getObject() on an inventory line (from
getFutureInventoryList) was always returning a movement. But sometimes we get
the inventory itself. So do not use getVariationCategoryList, but use the variation_text
stored in the stock table.

- Allow superuser to get RSS ;
- Remove useless portal_skin=RSS paremeter.