When a product has a safety stock in an area, and the current stock is
below safety, but there are moves in the future, mrp_multi_level does
not compute an immediate action to get back to the safety stock.
This PR changes this behavior: when the mrp_moves are considered, before
processing the first move in the future, we insert a resupply action to
rebuild the safety stock.
We also add some refactoring in the process:
* add extension point on the wizard to compute the quantity to reorder
(so we can choose in a separate module whether to rebuild safety stock
or not)
* add extension point on the wizard to get the date at which the safety
stock must be rebuilt (defaults to today)
* make the code of the wizard symetric between the groupes and non
grouped configuration
* fix api.depends fields fro main supplier.
* fix ordering and missing demo file in manifest.
* Update README.
* fix action_view* methods.
* readd hook to exclude in mrp initialization
* fix computation of qty available (it was considering several times sub-locations).
* Remove contraint for outoing and incoming moves to be moved in/outside the company, they can be internal transfers.
* mrp.moves visible with technical settings.
* Show product and allow to search by it in mrp.inventory.
