* REST: stringreview round 1

 seems to make bogus code (but I'm not sure).

* configure.ac: added --with-xml2-config-path=PATH option.

* modules/gui/skins2/src/var_manager.cpp: delete the variables in the
  right order to avoid invalid reads in the destructor
* modules/gui/skins2/parser/xmlparser: skeleton of a new parser based
  on the text reader API of libxml2

* modules/gui/wxwindows/preferences_widgets.cpp: increased the min/max value for int config vars to +/-10000000.

* modules/mux/mp4.c: store the display size using the proper aspect-ratio.
   Size optimization for the generation of the stsc table.
   Some more clean-up.

 they miss the faad decoder without having an obscure segfault.)

* src/stream_output/stream_output.c, include/stream_output.h: new sout_AccessOutRead() funcion.
* modules/access_output/file.c: implemented sout_AccessOutRead().
* modules/access_output/udp.c: coding style cleanup.
* modules/mux/mp4.c: Added support for generating "fast start" files (ie. with the moov header at the beginning of the file).
   Started some code cleanup.

     filter more than 100% faster here (blend mode). Feel free to check
     if I haven't broken anything, first time doing Altivec ;)

More code cleanups.

* Add missing locks
* Duration sort

* modules/demux/mp4/mp4.c: don't segfault on reference files.

probably others.

 * removed an unused, and unreleased vlc_object_find()
 * added support for flac in mkv

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

 (we don't try anymore to fill our buffer every time).

 * comment out parsing of elements that no muxer ever used, and that are
   being removed from the spec. (patch by Mosu in the mkv team)

RGB2: Use fixed colormap entries black: 0, white: 255, and something
else 0x44.

RGB2 sorta works, but to do better we need a way to lookup a palette
color in a colormap.

          GNU/Linux. requires libsysfs (sysfsutils).

 * fixed a nasty integer overflow that caused items to be removed right away
   when the timeout value was large.
 * fixed a small mem-leak

 * fixed some minor bugs

 (not well tested)

ES_OUT_SET_GROUP_PCR.
 * net.c: commented out an error message in net_Write.

* modules/demux/dts.c: support for DTS WAV files.
* modules/codec/dts.c: support for 14bits little endian DTS bitstreams.