[IMP] stock: adjustment on product category + display exhausted products

Purpose:
For many SMEs, they print the inventory list, and then compare it with their
stocks. It is useful for them to see products with quantity = 0
Sometimes it is useful to see which product is exhausted, to check if it
matches the reality. If the product is not in the list, the user might
think that the system "forgot" about it.
When doing the starting inventory, all products = 0, the users don't want
to add it manually in the list.

Specification:
- Add the possibility to make the inventory of the product category
- Add a checkbox to also select stockable products with a quantity of 0
- Change the order in "Inventory of": it should be
	- All products
 	- One product category
	- One product only
	- Select products manually
- If "select one product only" or "select products manually" is true,
  hide "Include Exhausted Products".
- If "One product only" is selected, it should always display the product, even
  if the quantity is 0.
- When the inventory is started, the default sort should be done alphabetically
  on the product
- Hide the inventory location if "Manage only 1 Warehouse with only 1 stock
  location" is true.

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