- check transaction lines on invoice, stop and deliver invoice to be sure everything can pass later
 - set sensible precision for currency and use it to check values on transaction lines
 - fix: return created account in helper method



git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@26716 20353a03-c40f-0410-a6d1-a30d3c3de9de