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Some bugs that can't be solved easily prevents this feature to function
properly. Anyway, I let the issue on hold on the bug tracker.

Two new buttons for choosing between move or split mode.
Two new buttons for zooming in and out.

If the exposed area does not contain a rounded corner, only the exposed
area is painted. When the zoom is set to a very deep value this could
lead to a speedup of a factor 2.

Tells the user to read the INSTALL file first.

The class Transcode is not used anymore in the project.
The Ok/Apply/Cancel buttons of the settings interface are now connected

The black background is removed when the playback is starting and set
back again when the video is over. That way the black background does
not change the appearance of the video (and its proportions).

Remove those horribles colors in tracks and do something smoother.

Huge performance improvements, remove artifacts and open new ways for
doing *bling* *bling* effects!

The new mechanism is almost executed in o^1 (unlike the old one which
was more like o^n++). The result is a smoother GUI in some horizontal
operations and a lower CPU usage.

This should fix ticket #46.
I've identified some bottleneck in the timeline that slow down the GUI
when many items are inserted at the same time. This will be the subject
of an upcoming commit.

Removed useless code, code factorisation

When the Command is added to the stack, the backend must tell the GUI to
execute it. That way, we avoids "echo" and probably other weird things.

It's called when a project is loaded.

They seem buggy, and we don't need them.

This has to be temporary. A ticket has been opened.
Removed debug.