[glib] (20 commits) ...Merge branch 'refcount-box' into 'master'

[Emmanuele Bassi <ebassi src gnome org>]

Summary of changes:

  c5d2417... Add refcounted data (*)
  b607927... Add atomically refcounted data (*)
  8990c3c... Make g_rc_box_dup()/g_arc_box_dup() more generic (*)
  4b33b03... Improve the RcBox and ArcBox documentation (*)
  00a723f... Add reference counted strings (*)
  43b7a8f... Add size accessor to RcBox and ArcBox (*)
  32ecb86... Add length accessor for GRefString (*)
  3bc0499... Rename g_arc_box to g_atomic_rc_box (*)
  68304ae... Improve docs for g_rc_box/g_atomic_rc_box (*)
  7c4ac58... Allow NULL clear function when releasing references (*)
  61ca2e4... Check for overflow when allocating RcBox (*)
  501a8e9... Add missing copyright notice (*)
  4248b4b... Fix the implementation of interned refstrings (*)
  c342105... Add systemtap probes to refcounted data (*)
  18605db... Allow empty strings to be refcounted (*)
  cfe962a... Add missing trasfer annotation for g_ref_string_new() (*)
  3768794... Increase coverage for GRefString (*)
  0d00667... Increase coverage of atomic refcounted data (*)
  822b511... Update rcbox annotations for acquire/release functions (*)
  2585099... Merge branch 'refcount-box' into 'master'

(*) This commit already existed in another branch; no separate mail sent