base, account: fix is_zero and pay_and_reconcile test
base, account: fix is_zero and pay_and_reconcile test

vnc-biz/openerp-server,ovnicraft/openerp-server,MarkusTeufelberger/openobject-server,gisce/openobject-server,xrg/openerp-server,MarkusTeufelberger/openobject-server,gisce/openobject-server,splbio/openobject-server,xrg/openerp-server,gisce/openobject-server,vnc-biz/openerp-server,MarkusTeufelberger/openobject-server,splbio/openobject-server,splbio/openobject-server,ovnicraft/openerp-server