Merge branch 't/mood_cleanups'

Cooking since 2011-10-13, seems to be fine.

	6bcd10 mood: Deduplicate score formula.
	f24778 mood: Combine compute_num_played_score() and compute_last_played_score().
	62a968 mood: Don't open-code compute_dynamic_score().
	2c85cd mood: Don't add files without valid information to the score table.
	5e9ded mood: Simplify compute_dynamic_score().
	ab9f71 mood.c: Remove unused int_log2().

diff --cc NEWS
index fc6ccffb03a9ffc1903d66208bb097fb2e54fc64,d1155022a36e1c1ccf623c5eea59fd514463ed2f..980f613a7915e1a48d429ba17993d57572f4184f
--- 1/NEWS
--- 2/NEWS
+++ b/NEWS
@@@ -6,7 -6,6 +6,8 @@@ NEW
  ----------------------------------------------
  
        - audiod improvements and fixes.
 +      - buffer tree robustness improvements.
++      - cleanup of the mood subsystem.
  
  ----------------------------------------
  0.5.0 (2013-08-23) "invertible validity"