trade: Display tax lines in order printout

So far, simulated tax is not included in printed Orders. This allow to include expected tax in vat_list for printout.

This is done using `getPreferredTaxUseList` which is probably wrong and will hopefully be rewritten using more modern technologies (html not odt) and to use base amount, but this allows to make order printout show tax lines again.

See merge request nexedi/erp5!1168