New security scripts which are able to handle share.here, share.up and share.down rules in large trees as well as generate cartesian products for security groups whenever multiple values are defined for a given base category.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@12985 20353a03-c40f-0410-a6d1-a30d3c3de9de