fixed mpeg audio decoding)
vlc_demux.h: fixed COMMON_INIT_PACKETIZER (create a packetizer and not a decoder,
	fixed mpeg audio packetizer)

Treat all live555 versions before LIVEMEDIA_LIBRARY_VERSION_INT 1171929600 as if playStartTime() and playEndTime() didn't exist. Now only handle unpatched current versions of live library. 

  - Return correct item ids
  - Structures for navigating the playlist
  - Consistent locking
* Add a b_locked parameter to the remaining playlist API calls

* don't double free an object! Thanks to nivix for pointing me to the right direction and keeping to bug me about this. Fixes #978

(seriously, you should have switched to RTP for ages though)

- run RTCP over UDP-Lite for UDP-Lite streams (well, there is no standard yet...)

Still needs fixing

- optimize ..._sys_t layout a little