method defined in /ERP5/Document/Delivery.py (see
http://openbrick.org/cgi-bin/viewcvs.cgi/ERP5/Document/Delivery.py.diff?r1=2.38&r2=2.39 ),
so we can delete the re-definition of newCellContent()
in this Document.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@3492 20353a03-c40f-0410-a6d1-a30d3c3de9de