the `sale.order._create_invoices() method does not only requires
`create` access to the `account.move` and `account.move.line` models.

Because we're actually sorting lines after the creating, it requires
`read` access to sort, and `write` access to modify their sequence.

This is problematic when interracting with other modules like
`invoice_mode_at_shipping` where stock users are the ones to create
invoices.

This commit adds a few `sudo()` in the code, in order to avoid granting
`read` and `write` access to users that shouldn't be allowed to read and write invoices.

…nvoice_with_currency