[cinepaint/f20] (3 commits) ...- Fixing the cinepaintrc filename -> plug-ins are reachable without intervention - Fixing the defaul

[Jaromír Cápík]

Summary of changes:

  44830ac... - Fixing format-security flaws (#1037014) (*)
  8690e59... - Replacing the png patch with the upstream one (thx to Nic (*)
  8231b74... - Fixing the cinepaintrc filename -> plug-ins are reachable (*)

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