Add python 3 support

galatea.py

@@ -7,10 +7,10 @@ from trytond.transaction import Transaction
 from trytond.pyson import Eval
 
 __all__ = ['GalateaWebSite', 'GalateaUser']
-__metaclass__ = PoolMeta
 
 
 class GalateaWebSite:
+    __metaclass__ = PoolMeta
     __name__ = "galatea.website"
     esale_menu = fields.Many2One('esale.catalog.menu', 'Main Menu', required=True,
         help='Main menu product catalog')
@@ -30,6 +30,7 @@ class GalateaWebSite:
 
 
 class GalateaUser:
+    __metaclass__ = PoolMeta
     __name__ = "galatea.user"
     invoice_address = fields.Many2One('party.address', 'Invoice Address',
         domain=[('party', '=', Eval('party')), ('invoice', '=', True)],

menu.py

@@ -5,10 +5,10 @@ from trytond.model import fields
 from trytond.pool import PoolMeta
 
 __all__ = ['CatalogMenu']
-__metaclass__ = PoolMeta
 
 
 class CatalogMenu:
+    __metaclass__ = PoolMeta
     __name__ = 'esale.catalog.menu'
     website = fields.Many2One('galatea.website', 'Website')
 

payment_type.py

@@ -6,10 +6,10 @@ from trytond.pool import PoolMeta
 from trytond.pyson import Eval
 
 __all__ = ['PaymentType']
-__metaclass__ = PoolMeta
 
 
 class PaymentType:
+    __metaclass__ = PoolMeta
     __name__ = 'account.payment.type'
     esale_payment = fields.Boolean('Virtual Payment')
     esale_code = fields.Char('Code App Payment', states={

product.py

@@ -8,12 +8,12 @@ from trytond.transaction import Transaction
 from trytond.config import config as config_
 
 __all__ = ['Template', 'Product']
-__metaclass__ = PoolMeta
 
 DIGITS = config_.getint('product', 'price_decimal', default=4)
 
 
 class Template:
+    __metaclass__ = PoolMeta
     __name__ = 'product.template'
     esale_new = fields.Boolean('New', help='Icon New product')
     esale_hot = fields.Boolean('Hot', help='Icon Hot product')
@@ -52,6 +52,7 @@ class Template:
 
 
 class Product:
+    __metaclass__ = PoolMeta
     __name__ = 'product.product'
     add_cart = fields.Boolean('Add Cart', states={
             'readonly': ~Eval('active', True),

sale.py

@@ -6,10 +6,10 @@ from trytond.model import fields
 from trytond.pyson import Eval, Not, Bool, And
 
 __all__ = ['Sale', 'SaleLine']
-__metaclass__ = PoolMeta
 
 
 class Sale:
+    __metaclass__ = PoolMeta
     __name__ = 'sale.sale'
     galatea_user = fields.Many2One('galatea.user', 'Galatea User',
          readonly=True)
@@ -25,6 +25,7 @@ class Sale:
 
 
 class SaleLine:
+    __metaclass__ = PoolMeta
     __name__ = 'sale.line'
     sid = fields.Char('Session')
     galatea_user = fields.Many2One('galatea.user', 'Galatea User', readonly=True)

shop.py

@@ -4,10 +4,10 @@
 from trytond.pool import PoolMeta
 
 __all__ = ['SaleShop']
-__metaclass__ = PoolMeta
 
 
 class SaleShop:
+    __metaclass__ = PoolMeta
     __name__ = 'sale.shop'
 
     @classmethod