TODO.txt

* ask the user if he wants to hear the songs just added.
* convert UI into actions, then a toolbar
* albums!
* various artists albums
* fix hysteresis in search
* notifications
* when playing a new file, show the current song only if the cursor is in the
  previous current song (so not to move it when the user is doing something else)
* headless!
* lock/unlock the grid

updateTimer= QTimer ()
updateTimer.timeout.connect (self.addNewSongsToUI)
updateTimer.start (1000)

def addNewSongsToUI ():
    # lock
    n= scanner.count
    # lock
    new= scanner.list[:n]
    scanner.list= scanner.list[n:]
    # unlock
    # add new songs
    if not scanner.finished:
        updateTimer.start (1000)