[Seaside] Non-blocking jQuery load

[jtuchel at objektfabrik.de]

As an illustration of what we want to do, you can look at the Wordpress 
Admin panel: teh traffic statistics come up with a "Loadind" Spinner, 
and while the statistics are being loaded from the Server, you can 
already click on links and immediately go to, say, the editor for new posts.

In our Seaside app, the browser will not react immediately but wait 
until all calls to load() have finished...

Joachim

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