[IMP] purchase: add activity view on main partner actions

Purpose is to extend the use of the newly-introduced activity view allowing
to see at a glance activities to perform on a given model. It eases daily
job of people working with activities.

Updated

  * purchase and RFQ main actions;
  * specific product actions defined for some menu actions in purchase;

This commit is linked to task ID 1889413.

addons/purchase/views/purchase_views.xml

@@ -54,7 +54,7 @@
         <field name="type">ir.actions.act_window</field>
         <field name="res_model">product.template</field>
         <field name="view_type">form</field>
-        <field name="view_mode">kanban,tree,form</field>
+        <field name="view_mode">kanban,tree,form,activity</field>
         <field name="context">{"search_default_filter_to_purchase":1, "purchase_product_template": 1}</field>
         <field name="search_view_id" ref="product.product_template_search_view"/>
         <field name="view_id" eval="False"/> <!-- Force empty -->
@@ -75,7 +75,7 @@
         <record id="product_product_action" model="ir.actions.act_window">
             <field name="name">Product Variants</field>
             <field name="res_model">product.product</field>
-            <field name="view_mode">tree,kanban,form</field>
+            <field name="view_mode">tree,kanban,form,activity</field>
             <field name="view_type">form</field>
             <field name="search_view_id" ref="product.product_search_form_view"/>
             <field name="context">{"search_default_filter_to_purchase": 1}</field>
@@ -387,7 +387,7 @@
             <field name="name">Requests for Quotation</field>
             <field name="type">ir.actions.act_window</field>
             <field name="res_model">purchase.order</field>
-            <field name="view_mode">tree,kanban,form,pivot,graph,calendar</field>
+            <field name="view_mode">tree,kanban,form,pivot,graph,calendar,activity</field>
             <field name="search_view_id" ref="view_purchase_order_filter"/>
             <field name="help" type="html">
               <p class="o_view_nocontent_smiling_face">
@@ -406,7 +406,7 @@
             <field name="name">Purchase Orders</field>
             <field name="type">ir.actions.act_window</field>
             <field name="res_model">purchase.order</field>
-            <field name="view_mode">tree,kanban,form,pivot,graph,calendar</field>
+            <field name="view_mode">tree,kanban,form,pivot,graph,calendar,activity</field>
             <field name="domain">[('state','in',('purchase', 'done'))]</field>
             <field name="search_view_id" ref="view_purchase_order_filter"/>
             <field name="help" type="html">