Project Cell should be a 'hidden content type'.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@30250 20353a03-c40f-0410-a6d1-a30d3c3de9de

bt5/erp5_project/bt/revision

-702
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+703
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bt5/erp5_project/bt/template_portal_type_hidden_content_type_list

 Project Line | File
 Project Line | Image
+Project Line | Project Cell
 Project Milestone | File
 Project Milestone | Image
 Project | File