This test is to find out the average time it takes for a remote
PYRO method call. Also it is a kind of stress test because lots
of calls are made in a very short time.

Note that if your Pyro server is running in multithreaded mode,
the performance will be lower than if it's in singlethread mode.
This is because multithreading has a big overhead when using
many short remote invocations (which is done here).
