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When there is an ambiguity, the caller is responsible for determining
whether a string is an URL or a path. In most cases, the string is
known as a file path.

This fixes some problems when the system or VLC play evil tricks with
the preprocessor. (Only files including sys/stat.h are concerned with
this commit. I did not fix all files.)

The implementation was slow/inefficient. This is really silly for
_performance_ counters. And contrary to the other statistics, nothing
actually reads them, except for debug logs.

If you really want debug-only performance timers, use this:

    mtime_t start, end;

    start = mdate();
    compute_decimals_of_Pi(100);
    end = mdate();
    msg_Dbg(obj, "spent %"PRIu64" us computing", end - start);

Re-license almost all of libVLC and libVLCcore to LGPLv2.1+

This move was authorized by the developers, either:
 - by e-mail,
 - by vote at the VideoLAN Dev Days 2011,
 - on the license website,
 - in a contract, oral or written.
No objection was raised, so far.

The developers agreeing are:
  Justus Piater
  Alexis Ballier
  Alexander Bethke
  Mohammed Adnène Trojette
  Alex Converse
  Alexey Sokolov
  Alexis de Lattre
  Andre Pang
  Anthony Loiseau
  Cyril Deguet
  André Weber
  Boris Dorès
  Brieuc Jeunhomme
  Benjamin Drung
  Hugo Beauzée-Luyssen
  Benoit Steiner
  Benjamin Pracht
  Bernie Purcell
  Przemyslaw Fiala
  Arnaud de Bossoreille de Ribou
  Brad Smith
  Nick Briggs
  Christopher Rath
  Christophe Courtaut
  Christopher Mueller
  Clement Chesnin
  Andres Krapf
  Damien Fouilleul
  David Flynn
  Sebastien Zwickert
  Antoine Cellerier
  Jérôme Decoodt
  Jérome Decoodt
  Dylan Yudaken
  Eduard Babayan
  Eugenio Jarosiewicz
  Elliot Murphy
  Eric Petit
  Erwan Tulou
  Etienne Membrives
  Ludovic Fauvet
  Fabio Ritrovato
  Tobias Güntner
  Jakub Wieczorek
  Frédéric Crozat
  Francois Cartegnie
  Laurent Aimar
  Florian G. Pflug
  Felix Paul Kühne
  Frank Enderle
  Rafaël Carré
  Simon Latapie
  Gildas Bazin
  Geoffroy Couprie
  Julien / Gellule
  Gildas Bazin
  Arnaud Schauly
  Toralf Niebuhr
  Vicente Jimenez Aguilar
  Derk-Jan Hartman
  Henri Fallon
  Ilkka Ollakka
  Olivier Teulière
  Rémi Duraffort
  Jakob Leben
  Jean-Baptiste Kempf
  Jean-Paul Saman
  Jean-Philippe Grimaldi
  Jean-François Massol
  Gaël Hendryckx
  Jakob Leben
  Jean-Marc Dressler
  Jai Menon
  Johan Bilien
  Johann Ransay
  Joris van Rooij
  JP Dinger
  Jean-Philippe André
  Adrien Grand
  Juha Jeronen
  Juho Vähä-Herttua
  Kaarlo Raiha
  Kaarlo Raiha
  Kamil Baldyga
  Keary Griffin
  Ken Self
  KO Myung-Hun
  Pierre Ynard
  Filippo Carone
  Loïc Minier
  Luca Barbato
  Lucas C. Villa Real
  Lukas Durfina
  Adrien Maglo
  Marc Ariberti
  Mark Lee
  Mark Moriarty
  Martin Storsjö
  Christophe Massiot
  Michel Kaempf
  Marian Ďurkovič
  Mirsal Ennaime
  Carlo Calabrò
  Damien Lucas
  Naohiro Koriyama
  Basos G
  Pierre Baillet
  Vincent Penquerc'h
  Olivier Aubert
  Pankaj Yadav
  Paul Corke
  Pierre d'Herbemont
  Philippe Morin
  Antoine Lejeune
  Michael Ploujnikov
  Jean-Marc Dressler
  Michael Hanselmann
  Rafaël Carré
  Ramiro Polla
  Rémi Denis-Courmont
  Renaud Dartus
  Richard Shepherd
  Faustino Osuna
  Arnaud Vallat
  Rob Jonson
  Robert Jedrzejczyk
  Steve Lhomme
  Rocky Bernstein
  Romain Goyet
  Rov Juvano
  Sam Hocevar
  Martin T. H. Sandsmark
  Sebastian Birk
  Sébastien Escudier
  Vincent Seguin
  Fabio Ritrovato
  Sigmund Augdal Helberg
  Casian Andrei
  Srikanth Raju
  Hannes Domani
  Stéphane Borel
  Stephan Krempel
  Stephan Assmus
  Tony Castley
  Pavlov Konstantin
  Eric Petit
  Tanguy Krotoff
  Dennis van Amerongen
  Michel Lespinasse
  Can Wu
  Xavier Marchesini
  Sébastien Toque
  Christophe Mutricy
  Yoann Peronneau
  Yohann Martineau
  Yuval Tze
  Scott Caudle
  Clément Stenac

It is possible, that some minor piece of code was badly tracked, for
some reasons (SVN, mainly) or that some small developers did not answer.
However, as an "œuvre collective", defined as in "CPI 113-2 alinéa 3",
and seeing "Cour. Cass. 17 Mai 1978", and seeing that the editor and
the very vast majority of developers have agreed (> 99.99% of the code,
> 99% of developers), we are fine here.

typo and double free

- Playlist items are stored only once. No category / onelevel separation
- Services Discovery nodes always stay a tree
- The playlist and Media Library are tree or flat depending on variable "playlist-tree".
  It means that if the setting variable says flat, the items that come from playlist
  demuxers are flattened into a single level list.
- The design demanded a different playlist demuxing system. Now playlist demuxers should
  construct a tree of items under an input_item_node_t root and send that using
  input_item_AddSubItemTree. Currently, the old scheme will be retained in modules, because
  there is still some listening to the old event in code (the libvlc media system for example)

Use var_Inherit* on parent object in playlist_Create()
Check "media-library" before calling playlist_ML*()

It is unused and not correctly implemented (!b_block case).

...and fix a memory leak in LUA

 - use automatic structure instead of heap
 - retain the playlist lock only while needed

We use a sizeof and not a strlen so that's ok.

This reverts commit 8ecb5ba1.

It previously assumed TRUSTED.
No functionnal/security changes in this commit.

Some interfaces may assert because of missing playlist lock.

Fix two potential segfaults.
Cosmetics.