[REF] stock_account,etc: FIFO and average costing method

The new implementation of stock moves the cost of products from quants to
moves. So we have implemented the FIFO and average cost method based on
those moves instead of using quants.
 - When average price is choosed, a field average_price is set on the
   product.
 - The tests have been completed with an example of how fifo work with
   negative stock.

As the use of real price method is really rare, because of the rigor
required on traceability for such method, we removed this functionnality.
 - The tests purchase/test/fifo_price.yml have been adapted to use the
   FIFO costing method instead of real price.

The old report stock history doesn't exist anymore, and is replaced by
the move view that contains all the cost information.

The methods `get_price_unit` have been moved from the stock to
stock_account.

The methods `_set_default_price_moves` and
`set_default_price_unit_from_product` have been removed from stock.

Explaination of FIFO and average:
 - In action_done for an out move in average and fifo, the price_unit and
   stock_value are updated.
 - For FIFO, it will use the qty_remaining on the in moves to check from
   which in moves to take the stock values for the out.
 - In case of negative stock in FIFO, it puts also qty_remaining on OUTs.
 - In the case of average, it will take the cumulated value of the last
   move and divide it by the quantity in stock.  

This commit is pretty much a 'work in progress':
 - Edit 'done' moves when the costing method is FIFO doesn't trigger the
   replay the FIFO stack.
 - The landed_costs feature doesn't work.

0 files changed, 0 insertions, 0 deletions