"Start the assistant" in info div does not work

[sylvainhalle]

When addding experiments to an assistant, the page reloads with the message "x experiments added; start the assistant". The "start" link in the message does lead to the assistant page, but the assistant does not start.

This is caused by the fact that the assistant page looks for the "start" parameter only in a POST HTTP request. That link loads the page with the correct parameter, but in a GET request.