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

Almost working test, Inventory API still does not process properly.

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

I am unsure if they should not instead be in the delivery movement group, that way we might be able to discard my change to ERP5Site and get rid completely of this inventory movement thing.

This fixes a regression with 445e8fa8 (ERP5TypeTestCase: rework
default manager password generation, 2024-05-27), it was no longer
possible to run live tests from a "normal" zope instance, this was
failing with:

Traceback (most recent call last):
  File "./eggs/Zope-5.10-py3.9.egg/Testing/ZopeTestCase/PortalTestCase.py", line 59, in setUp
    self._setup()
  File "./parts/erp5/product/ERP5Type/tests/ERP5TypeLiveTestCase.py", line 156, in _setup
    self.login()
  File "./parts/erp5/product/ERP5Type/tests/ERP5TypeTestCase.py", line 290, in login
    return PortalTestCase.login(self, user_name)
  File "./eggs/Zope-5.10-py3.9.egg/Testing/ZopeTestCase/PortalTestCase.py", line 146, in login
    user = user.__of__(uf)
AttributeError: 'NoneType' object has no attribute '__of__'

It was only possible from a runUnitTest instance.

Also: add `getTotalQuantity`. Why?

…and delete unused `z_catalog_stock_list_without_delete_for_inventory_virtual_movement`