Follows up change from `erp5_immobilisation`.

Fixes tests, otherwise, when accessing Inventory Line or Cell with
immobilisation module, we get:

> Error Value: 'RequestContainer' object has no attribute
> 'isUsingAmortisationMethod'

It is now needed to precompute inventories. Workflow has a new transition.

I believe the test was wrong from the beginning? It does not seem to match the comments.

- Test case where new stock in lesser than old stock
- Test recalculation of inventory
- Test full inventories
- Test `getTotalQuantity` and `getTotalPrice` methods

…and delete unused `z_catalog_stock_list_without_delete_for_inventory_virtual_movement`

Had I not done that before? How did it worked? Weird. Maybe just changed the configuration on the Portal Type ?

Inventories now contains Offset Lines and Cells which are the actual inventory
movements. Old Lines and Cells are simply a report from which offset is
calculated.

Add both components and Portal Types for new Inventory Offset Lines and Cells.

In order to have Inventory Offset Lines, we want the user to be able to check
the generated lines before validating. This commit therefore adds an
intermediate state `planned`, which will be used to trigger generation of
Simulation Movements and building of the offset lines.

Some other small changes have been done to make the actions' names more clear
and adhere to ERP5 standards, but all keep backward compatiblity: previous states
have been kept, and previously validated inventories are now recorded so that
no Simulation Movements will be generated that would impact stock values.