New release in series 1.2

These following packages have been released with some bugfixes:

• tryton-1.2.3
• trytond-1.2.3
• trytond_account-1.2.3
• trytond_account_invoice-1.2.3
• trytond_account_statement-1.2.1
• trytond_company-1.2.1
• trytond_party-1.2.2
• trytond_product_cost_history-1.2.1
• trytond_purchase-1.2.2
• trytond_sale-1.2.2
• trytond_stock-1.2.2
• trytond_stock_supply-1.2.1