6.4.0
- client (Unix): if app uses < 1 CPU, run at nice 10 (not 0)
- client: suppress specious error message
- MGR: Async RPCs: RPC thread is again a detached thread which stays running until Manager exits. Use wxCondition to block RPC thread when it is idle. This still avoids any Yield(), Sleep() and calls from RPC thread and reduces CPU usage from creating a new RPC thread for each RPC operation