This is done for all top level windows - ports, stats, logs
At startup, the local portgroup would automatically become current with
the result that the welcome page would not be visible. Not sure why but
an explicit setFocus of ports window seems to avoid it.
* Timestamp at millisec resolution
* Log level selection - Info by default
* Auto scroll control - enable(default)/disable
* Support copy (selected) logs to clipboard
* Support clear logs
* Annotate dock window title, if not on top (aka visible)
