- One to handle events expected as answers only, and to treat in their own thread.
 - One to handle all other events, and to tread them in dispatcher thread.
Update "expected answer" caller (app.py's _waitMessage).
Update test.


git-svn-id: https://svn.erp5.org/repos/neo/branches/prototype3@318 71dcc9de-d417-0410-9af5-da40c76e7ee4