RELEASE_NOTES: mention new filters
Always pass the configure option sysroot to --sysroot and -isysroot.

On darwin, --sysroot may be ignored.
lavf/concatdec: allow to match streams by id.

That makes the concat demuxer usable with MPEG-PS streams,
even when the streams in the different parts are detected
in different order.
tools: add dvd2concat.
ffmpeg: sub2video: send a last blank frame before closing.

Fix trac ticket #3420.
lavu: add myself as dynarray.h maintainer.
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  RELEASE_NOTES: mention new filters

Conflicts:
	doc/RELEASE_NOTES

Not merged as these things where in past ffmpeg releases already.
Or at least some of them where, volunteers to checks this and update
our release notes are welcome

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge remote-tracking branch 'cigaes/master'

* cigaes/master:
  lavu: add myself as dynarray.h maintainer.
  ffmpeg: sub2video: send a last blank frame before closing.
  tools: add dvd2concat.
  lavf/concatdec: allow to match streams by id.

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