[FIX] account, website_sale: do not set fpos on res.partner automatically

When a partner is created, the fiscal position is set automatically if
possible. This is not correct, the fiscal position should only be set
automatically on a SO, based on the delivery address.

Here is a scenario explaining the reason:
- Create 2 fiscal positions, one in US and one in Canada. Both fiscal
  positions apply automatically depending on the country.
- As an non-logged user, go in the web shop
- Buy a product
- At the checkout phase, the Billing Information are in US, but the
  Shipping Information in Canada.
- The fiscal position which will apply will be US, while you expect it
  to be Canada

The reason is that the fical position which applies is the one on the
parent partner (US in this case), since all children partners must have
the same accounting data.

With this fix, we simply remove the automatic setting of the fiscal
position on the partner.

opw-653072

addons/account/models/partner.py

@@ -228,18 +228,6 @@ class ResPartner(models.Model):
     _inherit = 'res.partner'
     _description = 'Partner'
 
-    @api.multi
-    def onchange_state(self, state_id):
-        res = super(ResPartner, self).onchange_state(state_id=state_id)
-        res['value']['property_account_position_id'] = self.env['account.fiscal.position']._get_fpos_by_region(
-               country_id=self.env.context.get('country_id'), state_id=state_id, zipcode=self.env.context.get('zip'))
-        return res
-
-    @api.onchange('country_id', 'zip')
-    def _onchange_country_id(self):
-        self.property_account_position_id = self.env['account.fiscal.position']._get_fpos_by_region(
-                country_id=self.country_id.id, state_id=self.state_id.id, zipcode=self.zip)
-
     @api.multi
     def _credit_debit_get(self):
         tables, where_clause, where_params = self.env['account.move.line']._query_get()

addons/website_sale/controllers/main.py

@@ -615,9 +615,6 @@ class website_sale(http.Controller):
                 partner_id = order.partner_id.id
 
         # save partner informations
-        if billing_info.get('country_id'):
-            billing_info['property_account_position_id'] = request.registry['account.fiscal.position']._get_fpos_by_region(
-                   cr, SUPERUSER_ID, billing_info['country_id'], billing_info.get('state_id') or False, billing_info.get('zip'), billing_info.get('vat') and True or False)
         if partner_id and request.website.partner_id.id != partner_id:
             orm_partner.write(cr, SUPERUSER_ID, [partner_id], billing_info, context=context)
         else: