color: sort output of 'debugcolor' The previous ordering were provided by the set. The new output is more stable and rational. In addition we have some logic to keep the '_background' version together to help readability.

color: extract color and effect display from 'debugcolor' We are about to introduce a second mode for 'hg debugcolor' that would list the known label and their configuration, so we split the code related to color and effect out of the main function.