playlist-item information.

* modules/codec/dirac.c: dirac decoder/encoder module based on libdirac (http://www.bbc.co.uk/rd/projects/dirac/index.shtml).

                     re-enabled OS X GL provider (QT output still default)

               not working in GL mode

* same options for node and items ATM
* some options still don't work

deletion (not intf-change)
modules/gui/wxwindows/*: clever item deletion using item-deleted

* delete everything related to groups from the item info panel
* some preparation work to reimplement the conextual menu

* implements deletion of playlist nodes
* fixes a bug in playItem:

* Each module can declare a "human-readable short name" with set_name
* Modules are sorted by category (set_category, set_subcategory).
  Modules configs can be separated by set_section()
* Separated audio-filter and audio-visual
* Separated extraintf and control
* New command and widget : add_module_list() for comma-separated modules
* Vfilters now use "," as separator

Won't work for many things (only those for which metadata can be gotten during initialization).

Processing is done asynchronously, use playlist_PreparseEnqueue to add an item to the queue.

              not enough VRAM for double-buffered ovelay

* src/misc/modules.c: only load the plugins once (as opposed to once per VLC object instance). Should benefit the mozilla plugin a bit.

Remove private LSN table rom cdda_t - just use it from cdio. 

Remove lsn from cdda.