[Cin] background render tip

[Andrew Randrianasulu]

While working on EDL support I noticed old Adobe Premiere (4.0, 4.2) had
interesting mode where you can output .mov from pre-rendered (with effects,
transitions, etc) workarea. In CinelerraGG you can get similar effect by
setting background render to jpeg, making sure your whole project got its
preview (red bar) rendered, then quit cin and execute something like this:

$ ffmpeg -f image2 -i ~/tmp/000%3d -c:v copy brender.mov

it will copy your background render jpegs into mov without re-encoding them

you might want to add '-r' too for specific framerate.

I wonder if libavformat-based mov muxer can be re-introduced for such task
.. (not feature request, just thinking). And may be 'delete brender files'
button (there seems to be some space in preferences/performance  GUI
window..)
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