[IMP] Make sure invoice_state of picking is used when creating extra moves and take price of related move if there is one

When we would copy, it gives problems as it won't be invoiced the correct way on sale, so we provide for a simpler solution.
[FIX] Adapt product variants in order to show internal code and ean13 #2772

[IMP] Typo
[FIX] Fix inheritance in point_of_sale views + ean visible on creation + landed costs views

[IMP] Set custom EAN not visible when multiple variants

[IMP] Change landed costs views + make ean visible upon creation
Merge pull request #2827 from odoo-dev/8.0-eanproductviews-2772-jco

8.0 eanproductviews 2772 jco
Merge pull request #2918 from odoo-dev/8.0-wmsextramoves-jco

[IMP] Make sure invoice_state of picking is used when creating extra moves
Merge branch '8.0' of https://github.com/odoo/odoo into 8.0-linux64