[MIG] Migration of account_renumber to 8.0.

Guewen, if you think your suggested form is better for any reason, let me know and I'll be very pleased to change the way I usually format strings in favour of a better programming practise. No irony, I'm completely serious about that.

Just keep in mind one thing: in this specific case, if previously existing form (which I didn't feel the need to change because I also use this with satisfactory results) was not wrong, why reject the PR?

I know it's difficult for collaborators to manage such a huge volume of information from hundreds of contributors, each one with his own quality standards. But the sad fact is that when I read your comment, I thought that it may take a few weeks before I come back to this issue. Before I made the proposal, using the module under Odoo was prioritary to me and I thougth that sharing it was a good idea. That has been done and, to be honest, the change you suggest is currently way down on my priorities list. Workday routine, you know.