[Cin] "color hell"

According to https://kdenlive.org/en/project/color-hell-ffmpeg-transcoding-and-preserving... bt 601 pal and bt 601 ntsc are slightly different, I tried to update CinGG's definitions so now she have two distinct 601 colorspaces, but I still can be wrong (esp on kr, kb coeffecients) can anyone test patch 3 and see if it makes any positive difference?