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You can not change a playlist_item_t to be a node, when you previously registered events on it, using input_item_t sub items adding event, because the pointer will be destroyed.
If you want to use nodes anyway, you have to explicitely create them.
Note: we were lucky that xspf did work so far, because we were EXCLUSIVELY using invalid pointers, except for the 1st item being added to each playlist_item_t (it did happen before the conversion obviously).

* Add some proper assert() to the vlc_gc_* function to spot errors.
* Correctly initialize the refcount to 1. (This will prevent freed pointer usage). (This may also introduce leaks in some module).
modules/*.c:
* Prevent some module to leak input_item_t.

Change demux2 capability values so the lua demux2 gets called as a last resort (2) right before the ps demux is forced (1).

Changes to the lua module's declaration: add luahttp alias and don't make it accept the luameta alias for all capabilities.

 * share/luaintf/http.lua: Equivalent of the legacy modules/control/http/
   module. (The new module takes 272 lines of Lua, instead of 5475 lines for
   the old one.) Functionality is basically the same except for CGI support
   which is missing.
 * share/http-lua/: The HTML files using the new <?vlc [lua code] ?> syntax.
 * modules/misc/lua/: Add Lua bindings for a few VLC function, the most
   important being the HTTPd high level functions, ACLs, stat and opendir.

The Lua code still needs to be cleaned up a bit.

   * Add vlc.license()
   * vlc.vlm.execute_command() now returns the VLC error code and the corresponding error message as 2nd and 3rd return values.
 * share/luaintf: add help and module description related stuff to the telnet and rc modules.

Fix a few FIXMEs.

Don't pop the string before using it (else our pointer points to garbage) and add a user friendly error message in vlclua_stream_new.

Two things led me to add this new type of Lua modules:
 * Most interfaces duplicate code from one another (rc and telnet both deal
   with sockets, rc and hotkeys duplicate VLC interfacing code)
 * It's easier to code in Lua than in C (for high level stuff)
(* Users can code their own module easily, all they need is a text editor.)

Most of the changes in modules/misc/ are Lua wrappers for different C APIs
in VLC. I'd say that 90% of those wrappers won't change, the other 10% might
 need small changes (mostly to simplify the C code).

The VLC Lua "interface" module will look for lua scripts in the
*share*/luaintf/ directory. Files in *share*/luaintf/modules/ are lua modules
which can be used by multiple VLC Lua modules (using require "modulename").

This commit includes 4 Lua interface modules:
 * dummy.lua: the default module. Prints error messages and quits.
 * rc.lua: equivalent to the legacy rc.c module. Also includes a bunch of
   new features (+ multiple socket connections at a time work!). See file for
   more details.
 * telnet.lua: equivalent to the legacy telnet.c module. See file for more
   details.
 * hotkeys.lua: a rewrite of the hotkey handling module. This module is still
   experimental. I'll need to change VLC core hotkeys stuff to make it work
   like I want (ie: 1 hotkey triggers 1 action instead of the current 1 action
   can have 1 hotkey). This version executes 3 dummy actions when keys 'q',
   'w' or 'x' are pressed.

What's left to do:
 * Port the http interface plugin to this framework (at least for the
   macros/rpn part ... using <?vlc some lua code ?> à la PHP would be way
   easier than what we currently have).
 * Finish work on the hotkeys module.
 * Code a real telnet/rc module with autocompletion and all the cool features
   usually found in a telnet/terminal interface.
 * Trash the legacy C modules.

Stuff to test (which I can't test myself):
 * Win32 and Mac OS X specific changes to Makefile.am
 * Console interface under Win32. I expect it not to work.

Other stuff included in this changeset are:
 * Code cleanup (I'm sure that it's still possible to simplify some of the old lua bindings code).
 * That's pretty much it in fact :/