[Seaside] WAApplication isDeployed vs. deploymentMode

[Bany, Michel]

> Currently these messages produce independent results. 

Yes, I am the one who invented #isDeployed and it was my original
intention to have the concepts independent. I suggested this idea at
one of my customers where they wanted to make sure that no one would
try urls like /seaside/counter in the deployed system but where
/seaside/config would have the toolbar.

Cheers,
Michel.