[gimp] (9 commits) Created branch pippin/linear-is-the-new-black

[Øyvind Kolås <ok src gnome org>]

The branch 'pippin/linear-is-the-new-black' was created.

Summary of new commits:

  bd034d4... app: make levels config request linear colors
  8977792... app: make curves tool pick in linear
  f278e94... operations: make brightness-contrast, levels and curves ope
  002f1de... app: default many created gimp_histograms to linear
  bd1ea05... app: unconditionally promote image to linear 32bit floating
  7fd2496... app: dither floating point result on load if original is 8b
  b06c36d... png: add a combo-box for specifying png bitdepth/variant
  44bad19... app: hide advanced color options
  1bf2228... app: add abstraction for separate blend and composite modes