Stop using "object_add" action category + hidden content type, use standard way (mainly because we cannot copy & paste, create new, or clone lines), the previous behaviour of staying in the delivery view is kept if we use this new action, with adding only one line.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@34443 20353a03-c40f-0410-a6d1-a30d3c3de9de