[IMP] l10n_pl: backport of fd86b7a to 8.0

[IMP] l10n_pl: some corrections in Polish CoA

PLN as default currency
Many improvements in taxes and fiscal positions
Fixes #825
[FIX] #3153 Digits in wizard should be those of moves,... / Recreate delivery order from sale / Delivery method on delivery order

[IMP] Provide better purchase order picking type

[IMP] Possibly a better product uos handling in the sale order line

[FIX] Recreate of delivery order when sales order in shipping exception

[FIX] Delivery method should be passed to delivery order
[FIX] Method should pass the correct objects for adding the line for the delivery method when invoicing based on shipments
[FIX] super of scheduler / delivery method and phantom boms / average price
[FIX] super of scheduler should have same params + use_new_cursor should be passed to procure orderpoint confirm

[IMP] Make sure the delivery works when doing phantom boms

[FIX] This should update the average price properly when having multiple moves with the same product

[FIX] Average price should take into account the quantities of all variants

[FIX] Make sure purchase picking type in other company works

[IMP] Views of quants and destination locations of moves
[IMP] When an inventory has lines already, don't delete them, that way we can import them

[IMP] Put the theoretical quantity when importing an inventory
[IMP] Update comments for inventory from import
[FIX] point_of_sale: I see a chrome receipt and I want it painted black ;)
Merge pull request #3601 from odoo-dev/8.0-wmsstagingx-jco

WMS STAGING X
- scheduler cursor and company_id
- digits in transfer wizard
 - delivery putting carrier on picking from sale and correctly invoicing it
- inventory import: imported lines should not be deleted
- average price correction for twice same product / variants
- recreate picking from sale order
- manual purchase order: picking type by default should depend on user's company
Merge branch '8.0' of https://github.com/odoo/odoo into 8.0-win32