- First read content-disposition header
  - if not found, then read real url used to download the file.
    Take into accounts HTTP redirections.
small refactoring to use dedicated utilities to parse urls and extract filename


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@38375 20353a03-c40f-0410-a6d1-a30d3c3de9de