[IMP] product: Order product.template by name

When no order is forced, it's more user-friendly if the products are ordered by alphabetical order.
This will mainly be applied:
* In the list view in the back-end
* In the eCommerce, for products with equal website_sequence
[FIX] point_of_sale: display an error when trying to print a receipt on an outdated posbox
Merge branch '8.0' of https://github.com/odoo/odoo into 8.0-linux64