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).

rebuild() does that and sets currentItem itself. Also emit
currentChanged on rebuild, so you stay on currentItem if you add/remove
columns on view.

Implement recursive sorting of a single playlist node from popup menu,
in either ascending or descending order. Node is sorted by values in
column which was right clicked to bring up the popup menu.

They don't have AM_DEFAULT_VERBOSITY.

This enables drag items from service discovery, I don't see why user
shouldn't be allowed to drag his/her favorite shoutcast/other item to
medialibrary or playlist from service-discovery lists.

Add new function which simplifies moving more then one item at a time and
reduces complexity and increases performance of such action.
Also refactor a bit old playlist_TreeMove.
Use new function in Qt4 playlist model.