The Folder meta type should only be used for modules (for now). In the future, there will be a ModuleType portal type of portal type, and Folder meta type will no longer be used and will only act as a base class.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@31469 20353a03-c40f-0410-a6d1-a30d3c3de9de