Merge branch 't/manual_improvements'

Cooking since 2014-01-25.

* t/manual_improvements:
  manual: Remove outdated sentence about para_afh.
  manual: Add description of ogg/opus.
  manual: Improve troubleshooting section.
  manual: Minor filter text improvement.

diff --cc NEWS
index cc9b67ad18da23606ca2167d8b1fe94da1cb4ee5,51d9db7c1e1b8b1b9c3ba201f464b29ebd25bcf4..b535dd6b7df182b3a9de88817b19701882c45c19
--- 1/NEWS
--- 2/NEWS
+++ b/NEWS
@@@ -1,14 -1,6 +1,16 @@@
  NEWS
  ====
  
-       - The new sync synchronizes playback between multiple clients.
 +---------------------------------------------
 +0.5.2 (to be announced) "orthogonal interior"
 +---------------------------------------------
 +
++      - The new sync filter synchronizes playback between multiple
++        clients.
 +      - Major cleanup of the networking subsystem.
++      - Improved user manual.
 +      - Minor fixes to avoid clang warnings.
 +
  ------------------------------------------
  0.5.1 (2013-12-20) "temporary implication"
  ------------------------------------------