Replace VAT extra by VIES and VIES-ALT as python-stdnum

issue6618
review35111002

setup.py

@@ -114,7 +114,8 @@ setup(name=name,
     license='GPL-3',
     install_requires=requires,
     extras_require={
-        'VAT': ['python-stdnum'],
+        'VIES': ['python-stdnum[VIES]'],
+        'VIES-ALT': ['python-stdnum[VIEW-ALT]'],
         'phonenumbers': ['phonenumbers'],
         },
     dependency_links=dependency_links,