Disconnect can now be delivered.
ProtObjFactory now creates Disconnect messages.
ClientHandle can now be streamed out.
ClientExecutor now has a set_client_handle member function
ClientHandle sets client handle on ClientExecutor when acting.
DefaultSocketSession does not call read after final message is finished.
LocalClient sends Disconnect in destructor.
Removed debug output.
Removed some debug statements.
Safer way to work on the IOOperation's in the DummySocket
Threaded sending of messages in client DefaultConnection

Fixed system tests that sometimes crashed because of messages interfering
with each other.