Merge branch 't/opus'

Was cooking for two weeks with no problems.

	273756 The opus decoder.
	7007ae The opus audio format handler.
	8bcf75 ogg/opus: Infrastructure.
	53133e speex: Don't export spx_ctl().

diff --cc NEWS
index 866904e32955d84a72ff8ba5d9e811a99de975fb,56f84753314b71f7f41b193eb4e7a6df6ce8d82f..19c98a4be597bf6d156ce29006f11944b7b7903c
--- 1/NEWS
--- 2/NEWS
+++ b/NEWS
@@@ -1,7 -1,7 +1,10 @@@
  ------------------------------------------
  0.?.? (to be announced) "spectral gravity"
  ------------------------------------------
++A new audio format, UTF-8 support, and tons of other improvements
++and fixes all over the place.
  
++      - New audio format: ogg/opus.
        - UTF8 support for para_gui and the mp3 audio format handler.
        - Scheduler improvements and fixes.
        - The obsolete gettimeofday() function has been replaced

diff --cc configure.ac
Simple merge

diff --cc error.h
Simple merge