There can be multiple reasons for not grouping payment lines:
* The customer needs each payment line individually for matching references.
* For avoiding the risk of returning a big amount.
* For not overpassing amout limits.
* ...
So with this commit, you have the possibility of selecting at payment mode
level if you want to group or not
Fix an important regression in account_banking_sepa_direct_debit: "Date of Last Debit" was not set any more
Proper write of date_done with account_banking_payment_export is installed without account_banking_payment_transfer
Add post-install script for date_sent on payment.order
