[gimp] (7 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:

  81eb91c... app: do promotion to float by default in default settings
  6d012dd... app: make levels config request linear colors
  38afec4... app: make curves tool pick in linear
  b059ea4... operations: make levels and curves operate on linear data
  2b4fe8a... app: default many created gimp_histograms to linear
  6f25900... app: hide advanced color options
  56f25a2... app: show overlay mode also in legacy mode menu

Commits added to the branch:

  361ca1b... app: show overlay mode also in legacy mode menu (*)
  a0822ee... app: do promotion to float by default in default settings
  da5378e... app: make levels config request linear colors
  3e04d86... app: make curves tool pick in linear
  a047a4c... operations: make levels and curves operate on linear data
  feb003b... app: default many created gimp_histograms to linear
  dcb8c91... app: hide advanced color options

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