7.0 account partner aged statement

Print & Send Partner Aged Statement by email
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This module adds in the system :
 * a new mail template "Aged Statement Letter";
 * the ability to print the partner aged statement;
 * a button "Send by email" in the partner form view which load the template
 and attach the statement to the email.

Comparing to 'Overdue Payment' report provided with OpenERP, this one adds more
informations :
 * the summary per period
 * the list of invoices per period
 * the invoices are also shown with the foreign currency

 Both messages, in the PDF and the email are taken from the Overdue Payments
 Message defined on the Company's configuration.