Histogram tweaks
Some minor fine-tunings.
The most interesting one is how the noise floor is marked on the histogram. Before, it was displayed in some sort of brown, but this color entry conflicts with fast zebras. Now it uses a fine noise pattern.
I'm interested to see how it looks on 4:3-screen cameras (solved, thanks Greg) and on 1100D.
Edit: in order to fix the "raw luma" quirk (linked below in Audionut's comment), I've changed the menu a bit. Does it make more sense now, or was it better before?