connected_fun with images

[balat]

If a request is not done by the client app but by the browser itself, for instance, images, client process cookies are not sent. If the service is using connected_fun (for example if you want to check rights before sending a picture), it will recreate the comet channels every time. (Actually it will create a new client proces state for each). And as the number of client processes is limited, the right client process (that is actually used by the application) is closed. And the page "Ocsigen process in eco-friendly mode" is diplayed.