[FIX] account: default partner format

When creating a new account.move.line, the computation of the default values should accept both `id` and `(id, name)` format.
The key partner_id may be containing a tuple so browsing should only be done on the first element of the tuple.
Fixes #3386
[IMP] doc: link logo to current doc's root, not to odoo.com
[IMP] doc: add link to company website in footer, fix release version
[IMP] doc: link directly to edition mode in docfiles
[FIX] updates the graph view documentation

It was wrong.
[FIX] pad: hide navbar when passing in fullscreen mode
[FIX] purchase: fixed recomputation of unit price when changing product quantity or uom
[FIX] product: pricelist now consider the quantity in product uom qty for rule application purposes
[FIX] product_visible_discount: display full unit price only when the discount column is displayed

Without this, the unit price is visually set to full, the discount column is not visible, but the actual price used in computation is the discounted price, very misleading !