/**

 * \addtogroup contrib Contrib

 *

 * The src/contrib directory is for contributed code that is being maintained

 * by the authors, but is not yet part of the main tree.

 * For instance, the developers may be requesting feedback on whether anyone

 * thinks the contributed model is generally useful to maintain in the main

 * tree, or may want feedback on the API or features.  If you find the

 * code in this directory useful, please let the ns-3 developers know.

 * Code may migrate from this directory to the main tree, or may be 

 * removed due to lack of interest, for a later release.

 *

 * - A class to generate graphs with gnuplot: ns3::Gnuplot and ns3::GnuplotDataset

 * - A class to hold configuration data:  ns3::ConfigStore and methods to allow the configuration to be read from and written to a file

 * - A graphical editor of the config store:  ns3::GtkConfigStore

 * - An object that garbage collects events:  ns3::EventGarbageCollector

 * - An object that provides "quick and dirty" delay and jitter estimation:  ns3::DelayJitterEstimation

 */