In a multi-company setup, if POS session is started on the main company and product have multiple taxes
(from current and child companies), tax computation should only consider current order's company taxes
backport of v7.0 addons revid: xal@openerp.com-
20130227115645-2oqyzd8blj9s5qap
bzr revid: xal@openerp.com-
20130227142739-hlgxhxrdrhix895e