Prepare migration to monorepo

--HG--
branch : 6.0

modules/edocument_uncefact/__init__.py

@@ -0,0 +1,13 @@
+# This file is part of Tryton.  The COPYRIGHT file at the top level of
+# this repository contains the full copyright notices and license terms.
+
+from trytond.pool import Pool
+from . import edocument
+
+__all__ = ['register']
+
+
+def register():
+    Pool.register(
+        edocument.Invoice,
+        module='edocument_uncefact', type_='model')