Tvheadend

Changelog:

• If a previosly detected DVB adapter was not present during startup,
  Tvheadend would crash. This is now fixed.

• If XMLTV grabbing was disabled tvheadend would spin in a 100% CPU loop.
  This is now fixed.

• The HTSP service is now announced via AVAHI (mDNS service discovery)

• Support for IPTV has been added. Only RAW TS in UDP is supported
  at the moment.

• Add support for setting default extra times to add before and after
  a recording. Useful if your TV shows never start on time.

• Use FFmpeg's av_interleaved_write_frame() or some players can't
  play the recorded content (vlc is one)