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Addresses issues #5 and #6 .
Verifies that the RS-HFIQ connection is interactive before setting oscillator current levels. Still have to use slight delays due to some race condition in Serial/Linux but behavior is much more reliable (on my system anyway).
Also ensures RS-HFIQ is keyed down when Quisk is closed. Keyup may still hang on if Quisk closes with an exception, which I've seen a few times. Not sure what to do about that, as it keeps close() from being invoked and since this is effectively a driver there is no access to the main threads to wrap in an exception and apply a shutdown hook.