Stock Valuation Fifo Lot

This module makes Odoo value stock using the FIFO (first in, first out) method separately for each lot or serial number, instead of mixing all units of a product together.

• On stock valuation layers, a new field lot_ids (Lots/Serial Numbers) is added and shown as tags in both the list and form views, so users can see which lot each valuation line belongs to.
• When an incoming transfer creates a valuation layer, the lot is recorded on it. If the product uses FIFO and is tracked, the product's standard price is updated to the cost of the oldest available lot.
• When an outgoing transfer is valued, the system picks valuation layers that contain the exact lot being shipped and consumes them in order of lot creation date, so the cost of the goods leaving matches the cost of that specific lot.
• If a move has no purchase order but has a single lot, the price unit is taken from the existing valuation layer of that lot.
• When a landed cost is validated, the lots produced by related manufacturing orders are written onto the generated valuation layers.

The module extends product.product, stock.move, stock.landed.cost and stock.valuation.layer. It depends on stock_account, stock_no_negative and stock_landed_costs.