[IMP] various improvements to the action manager (web client)

* add a replace_breadcrumb option to actionmanager
* correctly calls on_reverse_breadcrumbs when needed
* add a semi-protected way to manipulate breadcrumbs (get_widgets)
* calls do_show when changing widgets
[IMP]account : due date fill on change of payment term base on current date or invoice date,
[IMP]account_accountant, account_voucher: payment_option field are inherit in full accounting, and remove invisible attribute of payment_option and writeoff_amount