add account_trial_balance_period_xls

cf. https://github.com/luc-demeyer/account-financial-reporting/blob/7.0/account_trial_balance_period_xls/doc/doc.rst

for functional description.
User permissions: if the user has no permission on account.period, than he will already have a problem during the wizard.
active=False: account.period doesn't have an active flag (and shouldn't have one), this is an accounting report, all move lines have to be shown in a period range,