Dynamicaly add methods FolderMixIn instead of Folder because it's not reloaded and the reloading problem was still present.
Simplify the property filters : use __dict__ instale of dir(), which remove the need to check if the property is defined localy, and '_aq_dynamic' already matches the generic "not x.startswith('_')" rule.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@11877 20353a03-c40f-0410-a6d1-a30d3c3de9de