Merge branch 'master' into next

* master:
  Improve documentation of set_max_chunk_size().
  Warn about old (0.5.x or earlier) on-disk afhi.
  doxyen: Completely suppress brief descriptions.
  buffer_tree: Assert that we don't pass NULL to memcpy().
  mp.c: Remove a dead store.
  mood.c: Remove a dead store and fix the documentation of mood_load().
  flac_afh: Check for possible integer overflows.
  gcc-compat.h: Drop inline #define.