[MERGE] merged the dev branch with us letter format support for RML files

addons/account/project/report/analytic_balance.rml

addons/account/project/report/analytic_journal.rml

addons/account/project/report/cost_ledger.rml

addons/account/project/report/inverted_analytic_balance.rml

addons/account/project/report/quantity_cost_ledger.rml

addons/account/report/account_balance.rml

addons/account/report/account_central_journal.rml

addons/account/report/account_financial_report.rml

addons/account/report/account_general_journal.rml

addons/account/report/account_general_ledger.rml

addons/account/report/account_journal.rml

addons/account/report/account_partner_balance.rml

addons/account/report/account_partner_ledger.rml

addons/account/report/account_partner_ledger_other.rml

addons/account/report/account_print_invoice.rml

addons/account/report/account_print_overdue.rml

addons/account/report/account_tax_report.rml

...ns/account_analytic_plans/report/crossovered_analytic.rml

.../account_budget/report/analytic_account_budget_report.rml

addons/account_budget/report/budget_report.rml