Bank Payment XML Generation

[etobella]

For years, the generation of the SEPA files has been done by python directly. Would have sense to move all of this to qweb? We did this job several years ago in Spanish electronic invoice and it has worked quite nicely.

The idea would be to add the change on 19, as it might break existent dependencies.

The idea would be to use this: OCA/reporting-engine#1072

@OCA/banking-maintainers