Add option 'mandate_required' on payment orders
Autoselect first valid mandate on customer invoice that have a payment mode 'mandate_required' = True
Add option on select move lines to pay wizard to allow selection of litigation moves (unchecked by default), in order to integrate the feature of the module account_payment_blocking
Add button "Add to payment/debit order" on invoice form view
Started to integrate payment transfer in account_payment_order (not finished at all though)
Various fixes/changes/improvements/...
