Add variants on list view

review259391005

view/product_tree.xml

@@ -2,6 +2,8 @@
 <!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
 this repository contains the full copyright notices and license terms. -->
 <data>
+    <xpath expr="//field[@name='products']" position="replace">
+    </xpath>
     <xpath expr="/tree/field[@name='name']" position="before">
         <field name="code"/>
     </xpath>

view/template_tree.xml

@@ -7,4 +7,5 @@ this repository contains the full copyright notices and license terms. -->
     <field name="cost_price"/>
     <field name="type"/>
     <field name="default_uom"/>
+    <field name="products"/>
 </tree>