Add input_ItemAddOptionNoDup (unused at the moment)
+ free warning fix

Also, make it clearer what is shared and instance-specific

So,
libvlc_t ==> libvlc_global_t
vlc_t ==> libvlc_int_t (internal instance)

p_object->p_libvlc ==> p_object->p_libvlc_globale
p_object->p_vlc ==> p_object->p_libvlc

VLC_OBJECT_VLC ==> VLC_OBJECT_LIBVLC

And by the way, there is some cleanup required :) (ie, some things are created in the global object instead of the instance-specific one)

What is currently broken:
 * Some playlist demuxers (shout, dvb and pls)
 * DAAP
 * BeOS playlist
 * GPE playlist, I suppose

What has some trouble:
 * Meta handling in several demuxers (most notably TS)
 * Skins2 playlist (doesn't refresh correctly)
 * OS X playlist (see bigben's latest commits)

modules/misc/playlist/*, modules/access/http.c: XSPF playlist support
(read and write) by Daniel Stranger. Many thanks

src/misc/modules.c, src/misc/strings.c, include/vlc_strings.h: string
handling functions.

modules/control/http/*, modules/services_discovery/upnp_intel.cpp: use
these string handling functions.

(da big courmischage)

Change some message severities

* ALL: changed the prototype of module_Need() to accept a "strict" boolean argument.
If "strict" is true and a module name is provided then module_Need() will only look for the specified module
If "strict" is false, then module_Need() will first look for the specified module and if it wasn't found, will continue with the other modules with the same "capability".

much memory, and was inconsistent, especially with input_CreateThread
taking an array of options

* Revert to using array of options

* To add an item with options:
    - either use playlist_ItemNew, ItemAddOption, and then AddItem
      (useful if you don't have all your options in an array)
    - either use playlist_AddExt (use this if all your options are
      already in an array)

* To add an item without options: use playlist_Add

You can still add options after an item has been added by using either
playlist_AddOption or playlist_ItemAddOption

* Attempt to improve API and solve thread safety issues.
  - playlist_Item* functions allow to touch items only.
    p_item->lock must be used when needed
    (playlist_ItemNew, playlist_ItemDelete, playlist_Item*Info,
     playlist_ItemSet* )

  - playlist_ItemGetById and ItemGetByPos give you playlist_items
    for GetByPos, you should have the playlist lock

At the moment, the playlist_Set* and playlist_*Info functions are kept (they work with position) but should be avoided.

* A few coding style fixes
* Doxygenized a few functions

* Add missing locks
* Duration sort

* src/playlist/loadsave.c: errno.h related fixes.
* modules/demux/Modules.am: added missing ps.h.

* modules/gui/macosx/playlist.m: fix playlist_Export

* New playlist import/export system:
   -export plugin in misc/playlist (contains one module for each file type)
   -open plugin = special demuxer2, that can be opened from the command
    line or the graphical interface.
  NB: the demuxer "playlist" is forced to earn speed, but this does not
  work yet, as we have a demux2

* modules/gui/wxwindows: use the new import/export.

* src/playlist/group.c : fixed boundary check

* src/playlist/item-ext.c: correctly reset stuff when clearing the playlist

check that command line parsing still works for items and options? )

- src/libvlc.c
  include/vlc/vlc.h : New libvlc functions to get playlist status and
                      clear the playlist
     Patch by Tong Ka Man

- src/playlist/* : Update copyrights

- src/playlist/playlist.c:
  -When a user explicitely asks for an item, do play it, even if random mode
  -Do not stop playlist upon deletion of an autodelete item
  -playlist_Clear (Patch by Tong Ka Man)

* src/playlist/item.c
  src/playlist/info.c
  src/playlist/item-ext.c
  src/playlist/group.c
  src/playlist/sort.c
  src/playlist/loadsave.c
  include/vlc_playlist.h
      - New playlist_info structures and accessors
        It works pretty like the old input_info (with categories)
        It provides modularity to the playlist
      - Removed ppsz_options and i_options from playlist_item
        (we use the special category Options)
      - Added a unique id to each playlist_item to be able to track the
        items accross playlist reorders
      - Simplified adding of items.
           - playlist_AddExt is removed
           - playlist_AddItem is still here and exported but should not be used
           - use playlist_Add( p_playlist, uri, name, duration, mode, pos )
             and use the accessors for all other things
      - Added setters for fields of the playlist_item structure
      - Introduced "item-change" and "playlist-current" playlist variables
        to give more flexibility than only intf-change

      At the moment, duration is still in the structure (easier to use, IMHO)

* src/input/input.c
  src/libvlc.c :
        playlist item options parsing changed

* include/vlc_common.h : added playlist_info structures