Render progress flush to std out (tractor issue)

[GoodbyeKansas]

It appears that during rendering the <pre>Rendering image...: 83.01% </pre> is not flushed to stdout so tractor can't pick up on it while rendering. The whole log pops up when the image is done.
Could this be looked at?

-- Erik

[bdancer]

Try tomorrows build to see if my fix helps.

[GoodbyeKansas]

Thanks. Will test on monday.

-- Erik