* commit '38f0c078':
  lavfi: merge avfiltergraph.h into avfilter.h

Conflicts:
	doc/APIchanges
	ffmpeg_filter.c
	libavfilter/avfilter.h
	libavfilter/avfiltergraph.h
	libavfilter/version.h
	tools/graph2dot.c

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