With this module we can now add the price of the subcontracting on the
subcontracted move by using the `extra_cost` field on the MO and the
unit price of the PO.
We also enhance the view of the supplier info to display a checkbox if
the linked partner is a subcontractr, for clarity sake.
Joint work with: Arnaud Baes <arb@odoo.com>
task 1831382
