[IMP] sale_stock Show the button 'view delivery order' as soon as a picking exists

The button should appear no matter the state of the sale order, to be consistent with the rest of the application.
This makes it much faster for the sales person to find out about orders in shipping exceptions or already processed.
Fixes #256
[FIX] sale, crm_claim, crm_helpdesk: report menus

crm claims and helpdesk reports should be in Sales Report menu, not in project
The sales report menu is now defined in sales_team, which is a common dependance between crm and sales, instead of redefining this menu in each modules
[FIX] account: using wizard methods instead of invoice methods

Typo during port of account.invoice to new API.

(Rebase of 02a36b6 for #1052)