Add support for new banks

• Add becm, binck, bnpcards, gmf, suravenir
• Check for gmf interest (there does not seem to be a iter_history).
• Remove 'labelKey' from banks.json (they are just 'client.settings.key', update code for it as well as tests.
• Migrate banquepopulaire: banqupopulaire does not need migration, weboob does it (for now)