[FIX] website_sale: discount display in e-commerce

Each time the quantity of a product is changed, the price must
be updated according to the pricelist of the user.
When the price given by the pricelist is less then the unit price
of the product, the reduction of the price must be displayed.

A not stored computed field is added in model "sale.order.line"
to compute the discounted price because when the module
product_visible_discount is installed the price unit of a SO line
is the full price of the product and the discount related to the pricelist
is written in percent in the field discount(function "product_id_change"
in addons/product_visible_discount/product_visible_discount.py).

opw:660178

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