[DCP-o-matic] audiotrack designations

Hmm, weird, I sure do a fair bit of testing in DOM, but completely missed the part where the audio track/stream selection was eliminated and instead all available channels turn up in the audio matrix ;-) I noticed this is already the case in good ol' 1.83... While I like the idea and option to choose from all available tracks, even mix tracks from different languages, I would prefer to get some help in selecting the intended track from within DOM. Ffprobe does deliver language designations, and while they may not always be there or valid, it would sure be nice if the audio matrix could be enhanced with them? I do like the fact that DOM only chooses and assigns the first stream by default. I simulated it in the attached PNG, Carl, think about it. Maybe at the same time lines and columns could be given a source/DCP track designation as well? As an experienced user, it is very clear what goes where, but at first, it may be confusing to only see the matrix alone. - Carsten