encode whitespaces with '+', otherwise some user agents ignores everything after the first whitespace.
we need more encode for non-ASCII characers, that should be implemented in ERP5Site_redirect later.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@28373 20353a03-c40f-0410-a6d1-a30d3c3de9de