[control-center] (8 commits) ...Merge branch 'f16'

[Tomas Bzatek]

Summary of changes:

  28ceaa5... rebuild (*)
  99370a2... 3.1.5 (*)
  34f74df... fix sources (*)
  cc61008... Fix BRs (*)
  0b51fed... Obsolete control-center-devel (*)
  15d7d9c... avoid a crash in the absence of configured layouts (*)
  fe00536... bump rev (*)
  1e1a545... Merge branch 'f16'

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