Improvements include:
- full re-organisation of modules and big re-organisation of the code
- simplification of the code related to the fact that support for direct debit is now in t
he base module, not added by an optional module account_direct_debit (module was removed)
- new design of the wizard to select move lines to pay
- support for non-SEPA file transfer-
- support for German direct debit SEPA files (fixes bug #129)
- remove workflow of payment.order
* Finalise the wizard of selection of move lines to pay
* 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)
* Copy payment mode and mandate from invoice to refund
* Run dos2unix on the few files that had DOS carriage return
* Add _id suffix on M2O fields customer_payment_mode and supplier_payment_mode (Odoo did the same on all the M2O property fields of res.partner)
* Better handling of partner_bank_id and mandate_id on invoice: invisible/required/onchange
* Move field bank_account_required from module account_payment_partner to account_payment_mode
