In multivat setup, we need to create taxes in foreign countries to map them with domestic taxes. Before this commit, this was only possible manually, even though all the necessary information lies in Odoo's account.tax.template objects created by l10n modules.
We now display a banner on top of foreign vat fiscal positions with a button allowing instantiating those templates directly from them when it's appropriate.
closesodoo/odoo#75803
Task: 2453325
Related: odoo/enterprise#20553
Signed-off-by: Quentin De Paoli (qdp) <qdp@openerp.com>