Merge remote-tracking branch 'qatar/master'

* qatar/master:
  binkvideo: simplify and remove invalid shifts
  pulse: compute frame_duration once and fix it
  lavf: simplify format_child_class_next()
  hwaccel: OS X Video Decoder Acceleration (VDA) support.
  doc: add support for an optional navigation bar in texi2html pages

Conflicts:
	configure
	libavcodec/Makefile
	libavcodec/allcodecs.c
	libavcodec/vda.c
	libavcodec/vda.h
	libavcodec/vda_h264.c
	libavcodec/vda_internal.h
	libavcodec/version.h
	libavformat/options.c
	libavutil/avutil.h
	libavutil/pixfmt.h

Merged-by: Michael Niedermayer <michaelni@gmx.at>