[gimp] (16 commits) Non-fast-forward update to branch wip/pippin

[Øyvind Kolås <ok src gnome org>]

The branch 'wip/pippin' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  d289ee6... app: do promotion to float by default in default settings
  963df9e... app: make levels config request linear colors
  2a40079... app: make curves tool pick in linear
  17c7366... operations: make levels and curves operate on linear data
  d17f6b8... app: default many created gimp_histograms to linear
  40f0864... app: hide advanced color options
  10e9c9d... Enhanced smudge tool: Add painting ability to it. Detailed 
  da95c04... Add "No erasing effect" parameter to MyPaint brush

Commits added to the branch:

  dab9af6... Updated German translation (*)
  e75f2ff... Updated German translation (*)
  8c35cc9... app: add GIMP_TESTING_NO_GEGL_BLACKLIST flag (*)
  f981f83... plug-ins: replace deprecated enum values in py-slice plug-i (*)
  c2f0226... Bug 781408 - script fails due to error in edit-copy / edit- (*)
  6eeb5c2... app: support clipboard images in the clipboard brush and pa (*)
  cb795e8... app: add a FIXME about clipboard images in GimpBufferView (*)
  bcc3437... Bug 344684 - Greyscale (no alpha) clipboard brushes are of  (*)
  3033f55... app: do promotion to float by default in default settings
  25b73d3... app: make levels config request linear colors
  1d02b74... app: make curves tool pick in linear
  11248f1... operations: make levels and curves operate on linear data
  2d84851... app: default many created gimp_histograms to linear
  866ff45... app: hide advanced color options
  15710fe... Enhanced smudge tool: Add painting ability to it. Detailed 
  8267f00... Add "No erasing effect" parameter to MyPaint brush

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