Also fix the initial refcount for the media list, that was causing a bunch of problem on the test suite.

vlc_assert_locked should probably be exported, as it would have been useful here.

so eg mobile-stream goes like this
--sout="#transcode{vcodec=h264,venc=x264{profile=baseline,level=12},...."

..or it magically eats itself up

...and fix memleak when removing..

If playlist view was full with items it was hard/impossible to
add node to root if the action operated on right-clicked item.
Sort action follows the same style for consistence and practicality.

all files would be opened as directories

Pointed-out-by: cachereturn on #videolan

"[It] can be removed altogether, since it's totally useless (quality
is too bad to be of any use)."

free to change the value if needed).