- use list of string instead of adding string to strings
  in order to improve performance
- use message id instead of session id. Increase message id
  for each message
- start to implement authentication


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@14280 20353a03-c40f-0410-a6d1-a30d3c3de9de