* doc/skins/skins2-howto.xml: Added documentation for this attribute

* modules/gui/wxwidgets: display and resizing of the embedded playlist should behave a lot better now.

* Don't expand nodes by default
* Distinguish notification types from document to view
  ( update of one item, global change, append of one item)
* Handle item-append 
   - Add a command/callback
   - TODO: Only rebuild the tree image if the newly appended item is 
     visible
* Rename m_lastPos to m_firstPos as it represents the first position
* Beginning of a general ensureVisible function (not working yet)

   XML example:
       <PopupMenu id="sample_menu">
           <MenuItem label="Play" action="vlc.play()" />
           <MenuItem label="Pause" action="vlc.pause()" />
           <MenuSeparator />
           <MenuItem label="Show playlist" action="playlist_window.show()" />
           <MenuItem label="Hide playlist" action="playlist_window.hide()" />
           <MenuSeparator />
           <MenuItem label="Quick open file" action="dialogs.fileSimple()" />
       </PopupMenu>

   To call the menu:
       <Button action="sample_menu.show()" ... />

   Known bug: the popup disappears when the user clicks "too fast" on the
   button: the control refreshes itself in an asynchronous way, and the popup
   dislikes it... so click slowly :)

Do not crash on vlm command: 'new somestring vod enabled', when the user forgot --rtsp-host <ipaddress>:<port> on the vlc commandline.

Case matters when using filenames!

Thanks.

(can be disabled with an advanced option)

First steps towards integrating coreaudio and auhal module into one. It does not actually render digital audio yet.

- the marquee section is already completely usable, more to come
- TODO:
    - fix all FIXMEs
    - implement the logo and time settings completely
    - implement l10n
    - fix 10.3 compatibility (runs under Tiger only atm)
    - save the preferences, if requested
    - close a current vout and re-open it, when a filter is (de-)activated
    - redesign the GUI to a smaller panel

playlist-current must not be handled by a full rebuild but by two item updates, on oldval (to remove its playing status) and newval (to give it playing status)

  "nbFrames" and "fps" in the (Sub)Bitmap elements to set the number
  of frames and the frame rate in a bitmap. As in the radialslider,
  the different frames are just laid vertically in the bitamp (and
  all the frames must have the same size)
  At the moment animated bitmaps are only supported in Button controls.

It is called by asyncqueue if remove flag is true, to let the newly added command check if it wants its predecessors to be removed.

Default is to always allow. Only implemented in CmdPlaytreeUpdate: only remove previous commands if they are about the same item.

-> Limit excess updates to playtree

(There are some debug messages left in this commit, will remove later)

* modules/gui/wxwidgets: wxwidgets 2.4.2 compilation fixes as suggested by Charlie Ledogar (charlie10 at gmail dot com)

The previous commit and this one globally have a rather negative impact, as we notify playlist waaayy too much while adding info. Should either be implemented in interface to reduce the number of updates, or as a flag to add_info if we have some more to do afterwards