Merge branch 'refs/heads/t/dynamic_chunks'

Merge branch 'refs/heads/t/dynamic_chunks'

A rather long and intrusive series that finally improves the aac
decoder and audio format handler.

The merge had a minor conflict in error.h, which was easily resolved
by removing both affected error codes.

Cooking for a month.

* refs/heads/t/dynamic_chunks: (24 commits)
  afh_recv: Check return value of afh_get_chunk().
  aacdec: Decode only one frame per iteration.
  aacdec: Combine aac_open() and aacdec_open().
  aacdec: Make "initialized" a boolean.
  aacdec: Make frame_info local to ->post_select().
  aacdec: Remove pointless assignment.
  aacdec: Remove pointless check and improve comment.
  aacdec: Rename buffer variables.
  aacdec: Remove pointless variable p.
  aacdec: Remove check which is always true.
  aacdec: Kill pointless label.
  aacdec: Remove superfluous assignment.
  aacdec: Improve and silence error message.
  aacdec: Prefer NeAACDecInit() over NeAACDecInit2().
  aacdec: Don't eat full buffer on errors.
  Combine aacdec and aac_common.
  Convert the aac audio format handler to libmp4ff.
  aac_afh: Don't create chunk tables any more.
  afh: Dynamic chunks.
  server: Store max chunk size in database.
  ...