Configuration Update Manager project
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The Configuration Update Manager project consists of two modules:

Configuration Update Base: A base module providing functionality related to
  updating and computing differences between configuration versions. No
  user interface; used by other modules such as Features.

Configuration Update Reports (in the config_update_ui sub-directory of this
  project): Adds an updates report and revert functionality to configuration
  management.  Depends on Configuration Update Base. For more information, see
  the README.txt file in the subdirectory.