Get light-viz to work with client-server connection

[mathturtle]

Eventually we want to do client-server where they are not on the same machine...

[jenikovsky]

If I understand the request right then that is possible to do following the multi-user setup guide

[jourdain]

It is possible to deploy for multi-server setup. The current limitation is related to the fact that the dataset listing is expected to be on the machine that do the web delivery. This means, we can not start a remote pvserver if the dataset can not be accessed from the Web server machine.