Make accumulation mode as default for realtime display

[linzuzeng]

ETA is now always running in real time mode.

If you're trying to analyze an existing file on disk, and you clicked the "view results" button too early, you will only see the part that has been analyzed before you click that button. You have to click accumulation button if you want to see the rest part of the file. Someone says it's a bit confusing.

Do you know how to make the accumulation mode as the default? If the user wants to pause the and the analysis he could just click Pause.

@gyger