Merge branch 't/sched_improvements'

diff --combined NEWS
index a9572d7b45de854b175f2c581668dc6091243941,c6c2e4dbd741954bd344d5b240e7ba98851ff7e8..f76a6e97c1ed9e6d27ddb91a7637b2e550c35fbe
--- 1/NEWS
--- 2/NEWS
+++ b/NEWS
@@@ -2,22 -2,11 +2,23 @@@
  0.4.8 (to be announced) "nested assignment"
  -------------------------------------------
  
 +Gcrypt support, the overhauled osx writer and regex format specifiers
 +are the highlights of this release.
 +
 +      - support for libgcrypt as a drop-in replacement for openssl.
 +        Run configure --enable-cryptolib=gcrypt to link against
 +        libgcrypt. The two crypto implementations are compatible to
 +        each other, i.e. a para_client executable linked against
 +        gcrypt can connect to para_server linked against libssl
 +        and vice versa.
 +      - Rewrite of the osx writer (output plugin for Mac OS).
        - audiod: The format specifier for receivers, filters and
          writers is now treated as a regular expression. This allows
          to replace 5 lines in the config file (one for each audio
          format) by one single line. See the manual for details.
        - Compiles cleanly also with llvm/clang.
 +      - Corrupt mp3 files are handled more gracefully.
++      - sched: Optimized zero timeouts.
  
  --------------------------------------
  0.4.7 (2011-06-01) "infinite rollback"