Add expand on tree view

and unify layout of form view.

issue8644
review262131002

view/cultivar_group_list.xml

@@ -2,5 +2,5 @@
 <!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
 this repository contains the full copyright notices and license terms. -->
 <tree>
-    <field name="name"/>
+    <field name="name" expand="1"/>
 </tree>