need more graceful way to quit midstream (not a high-priority isse)

[marybeckman]

Currently the node for quitting is coded as follows:

    if trans_node$ == trans_node_quit$
        # If the transcriber decided to quit, then set the 'trial'
        # variable so that the script breaks out of the while-loop.
        trial = nTrialsCV + 1
    endif

Mary noted in transcribing that: "This results in a very ungraceful way to quit midstream. Figure out a better way."
This is very low priority by comparison to other still open issues with this kludged together release.