Editing a Movie Cube

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An existing movie cube (stored in array $data11) can be edited with this
tool in a few ways. There are 2 flips, either an up/down or right/left.
(Perhaps more flips will be added eventually) and you can remove a frame
or a range of frames. The frame number is always for the current cube so
if you remove a particular frame number, remember that frames after that
one will be re-numbered. This can be inconvenient of course. It means
that if you decide that frames 12, 17, and 20 are bad, you would be
best off removing them in the order 20, 17, and 12. If you remove 12
first, then the old 17 becomes 16. So you would have to remove 12, 16,
and 18 to get the desired effect.

You can also specify a range of frames to be removed with the first
and last values separated by a colon, e.g., 20:24 will remove 5 frames.
Be careful with this option since the parsing code for it isn't very
smart.

For removal, you can either enter the value(s) in the text field and
hit CR (return) or hit the button to do perform the removal. Don't
do both!