[FIX] stock_account: inventory at date

The "Inventory at Date" has several issues:
- graph and pivot views are not available despite their existence
- the views are not linked to an action, thus it is impossible to save
  it on the dashboard.

opw-703649

addons/stock_account/report/stock_history_views.xml

@@ -58,4 +58,10 @@
             </search>
         </field>
     </record>
+    <record id="action_stock_history" model="ir.actions.act_window">
+        <field name="name">Stock History</field>
+        <field name="res_model">stock.history</field>
+        <field name="view_type">form</field>
+        <field name="view_mode">tree,graph,pivot</field>
+    </record>
 </odoo>

addons/stock_account/wizard/wizard_valuation_history.py

@@ -19,12 +19,19 @@ class WizardValuationHistory(models.TransientModel):
             history_date=self.date,
             search_default_group_by_product=True,
             search_default_group_by_location=True)
-        return {
-            'domain': "[('date', '<=', '" + self.date + "')]",
-            'name': _('Stock Value At Date'),
-            'view_type': 'form',
-            'view_mode': 'tree',
-            'res_model': 'stock.history',
-            'type': 'ir.actions.act_window',
-            'context': ctx,
-        }
+
+        action = self.env['ir.model.data'].xmlid_to_object('stock_account.action_stock_history')
+        if not action:
+            action = {
+                'view_type': 'form',
+                'view_mode': 'tree,graph,pivot',
+                'res_model': 'stock.history',
+                'type': 'ir.actions.act_window',
+            }
+        else:
+            action = action[0].read()[0]
+
+        action['domain'] = "[('date', '<=', '" + self.date + "')]"
+        action['name'] = _('Stock Value At Date')
+        action['context'] = ctx
+        return action