[gegl] (11 commits) ...plasma: use gegl-op.h

[Øyvind Kolås <ok src gnome org>]

Summary of changes:

  9bde8c3... Add key/value property-key meta-data store for paramspecs (*)
  0e30e20... gegl-op.h: a new way of chanting ops (*)
  7d47668... threshold: use gegl-op.h
  50ec9b4... emboss: use gegl-op.h
  9c50b32... panorama-projection: use gegl-op.h
  062b39f... checkerboard: use gegl-op.h
  6b0a665... color: use gegl-op.h
  944abd9... noise-rgb: use gegl-op.h
  af272fa... layer: use gegl-op.h
  701ab61... brightness-contrast: use gegl-op.h
  bf5642a... plasma: use gegl-op.h

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