1) Add 4 new modules to handle payment mode and bank accounts:
- account_payment_partner
- account_payment_sale
- account_payment_sale_stock
- account_payment_purchase
2) Filter the selection of invoices per payment mode.
Add active field on payment.mode and payment.mode.type.
Add menu entry for Payment Types.
3) Small code clean-up in the SEPA modules (views, 'state' field on SEPA file objects)
4) Code enhancement in the file account_banking_payment/model/account_payment.py (PEP-8, _prepare_* functions, support for payment lines with move_line_id = False)