[Cin] export_edl patch

[Andrea paz]

Preface: I do not use and do not know how to use other NLEs than
CinGG. I installed them just to see their functionality and updates.

Kdenlive creates an edl (even though it calls it .xml) via
OpenTimeline. This doesn't work for me on either Kdenlive itself or
Olive (which uses OpenTimeline). The error is that the format is not
recognized.
DaVinci Resolve creates an edl file that is not recognized in Kdenlive
and Olive. Even inside DVR itself it is opened but it doesn't work.
Anyway I don't know how to use DVR so it's sure that I'm wrong in
something.
The DVR edl is recognized in Openshot, but it doesn't open it because
it can't find the original source. Again, I don't know how to do this.

See the files at:
https://www.dropbox.com/s/8nau5lvn7ymrgqr/edl.tar.gz?dl=0