Merge branch 'jc/latin-1' into maint

Some platforms no longer understand "latin-1" that is still seen in the wild in e-mail headers; replace them with "iso-8859-1" that is more widely known when conversion fails from/to it. * jc/latin-1: utf8: accept "latin-1" as ISO-8859-1 utf8: refactor code to decide fallback encoding