- use Base_redirect instead of ERP5Site_redirect
- removed checkout web section
- fixed the visibility of some fields from SaleOrder_viewAsWeb
- added tips to shopping cart to help with the purchase procedure
- removed useless script

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@30684 20353a03-c40f-0410-a6d1-a30d3c3de9de