Updating View without changing focus

[William Shipley]

We should probably move this conversation over to next-prog.

In general, omniweb 1.0 simulated multi-threading by calling the event loop  
periodically from within its socket-reading functions, which was how the  
CERN library we borrowed forced us to do things.

In 2.0 we've thrown away the CERN library, and gone with a true  
multi-threaded design.  The threads communicate with the main thread via a  
queue, the main thread is the only one that talks to the window server.

-Wil