GLI update for remote greenstone server

[max]

We may think of an option when using GLI with a remote GS2 server (hosted on a shared server for instance) that will allow to do the building locally and then zip the built collection and send it to the server.

This will help the server to not over use the CPU or their cheap shared servers when building collections so people won't have their account suspended. The server will only be used to serve collections.