* IMP: Add options to show partner bank account on invoice report
* FIX: Don't auto-assign partner bank account due to problems when you have a direct debit payment
method with bank_account_link = 'fixed'. Bank account is shown through new mechanism.
* Change copyright and author after company merging
* Fill payment mode in invoices if none is provided
Using same method as in upstream, payment mode is filled on invoice creation if
no payment method is provided. This way, we don't need to install
account_payment_sale if we don't want to handle several payment modes at sales
level. Even more, if we install the module later and we have already existing
sales orders without payment mode filled, those orders will be invoiced with
the customer payment mode.
* Signature changed in convert_to_write
