[IMP] website_portal_sale, website_quote: portal access right

Portal has access (read only) to partner, pricelist,
taxes, ... These access were given to display informations
on portal pages. Since, these are not very secure, we
remove the access right.

Some modifications are required to make the portal work again :
- 'sudo' business document before rendering templates. ir.rule
are still apply to filter the documents do display.
For instance, SO total amount is computed using account.tax.
- a related field has been added on SO line to allow portal user
to see the image of the ordered product (on SO frontend view)
- a new controller is created to display invoice PDF (as 'sudo'),
since the rendering of this document required read access to
taxes, payment terms, ...

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