Improve report_account module

Registered by Fabien (Open ERP)

We need the following improvements in report_account:
  - a report by month of the sales by product and type of account, here are the columns, as a postgresql view:
      period_id, product_id, qty, user_type_id, amount
    user_type_id comes from the account
  - a report by month of the sales by prodict and account, here are the columns, postgresqkl view:
      period_id, product_id, qty, account_id, amount

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