[FIX] report: correct page numbering
[FIX] account_analytic_analysis: recurring invoices prepare and product_id_change

product_id_change set the description with the same behavior as sale orders
product_id_change set the price unit according to the pricelist
_prepare_invoice is split into two sub methods, _prepare_invoice_data and _prepare_invoice_line
_prepare_invoice actually prepare the invoice values instead of directly creating the invoice
[MERGE] Forward-port of latest 7.0 bugfixes, up to rev. b6a7402fdbddfe817fa36292e6f89e8659f9bdea