New VLC_EXPORTs are now added at the end of module_symbols_t so that
offsets of other function pointers are preserved.

Deleted VLC_EXPORTs are replaced with dummy pointers for padding.

Of course, it doesn't solve the problem with changing shared structures
format :/ and it may cause SVN conflicts when multiple people changes
VLC_EXPORT. I doubt it can be avoided though.

* Fix several problems with the auhal module. only the problem with the changing inNumberFrames should be left. We need to add a buffer system to take care of this issue...

* Revert the coreaudio resampler to it's simpler variant again. the builtin resampler of the new auhal module takes care of the special case in which this resampler wasn't working. It would be better to really fix it, but i cannot find the problem.

* modules/demux/mp4/mp4.c: we don't need to re-packetize h264 data into annexe B bytestream anymore since new versions of ffmpeg deal with it properly.

* standard.c: sap-ipv6 is no more used

* modules/mux/mpeg/*: add the mpeg4 video VOL data inside EStoPES so it can be used by the PS muxer as well.

	 skip deprecated options

* modules/mux/mpeg/ts.c: proper muxing of ISO/IEC 14496-2 (aka mpeg 4 video) as specified in ISO/IEC 13818-1

* modules/packetizer/mpeg4video.c: remove the VOL from the packetized stream and put it in fmt.p_extra instead.

* modules/codec/ffmpeg/video.c: codec extra data is sometimes not available before the 1 frame is fed to the decoder.

* src/input/decoder.c: check for codec extra data changes when a packetizer is inserted before the decoder.

- automatically select SAP multicast address (closes #141)
- some clean up

   are not multithreaded.

   libmpeg2 cvs HEAD.

   a change of aspect ratio. Factorized aspect ratio code. A change of
   aspect ratio is only supported in the mosaic_bridge module, not in
   transcode.

   transcoding, transcode will take our fmt_out as a fmt_in to libmpeg2.
   libmpeg2.c will then believe that the user has requested a specific
   aspect ratio, which she hasn't. Thus in case of aspect ratio change,
   we're screwed.

   causing problem with some compiler versions.

   due to a recent change of the default value in ffmpeg which used to be
   YUV 420P). Forward i_rate in case a transcode or display operation
   takes place after switcher.

   parameter to specify the sample aspect ratio of the destination
   background. In this case, one of {width, height} can be omitted (set
   to 0) and it will be calculated based on the PAR of the source and
   the SAR of the background.