[FIX] base: correct non-copy of `login_date` + adapt tests
[FIX] im_odoo_support : fix event triggered to bind event on dropdown usermenu item.
[FIX] website_sale: auto-confirm free orders upon cart validation

Orders are normally confirmed when the payment transaction
is processed, but there is no transaction for free orders.
This caused them to stay in draft until manually cancelled.
[FIX] website_sale: avoid subscribing the website user (Public) to all shop orders

Especially as this user does not have a valid email, which
could prevent notifications to reach other followers.