////////////////////////////////////////////////////////////////////////////////
/// @startDocuBlock JSF_get_admin_statistics_description
/// @brief fetch descriptive info of statistics
///
/// @RESTHEADER{GET /_admin/statistics-description, Statistics description}
///
/// @RESTDESCRIPTION
///
/// Returns a description of the statistics returned by */_admin/statistics*.
/// The returned objects contains an array of statistics groups in the attribute
/// *groups* and an array of statistics figures in the attribute *figures*.
///
/// A statistics group is described by
///
/// - *group*: The identifier of the group.
/// - *name*: The name of the group.
/// - *description*: A description of the group.
///
/// A statistics figure is described by
///
/// - *group*: The identifier of the group to which this figure belongs.
/// - *identifier*: The identifier of the figure. It is unique within the group.
/// - *name*: The name of the figure.
/// - *description*: A description of the figure.
/// - *type*: Either *current*, *accumulated*, or *distribution*.
/// - *cuts*: The distribution vector.
/// - *units*: Units in which the figure is measured.
///
/// @RESTRETURNCODES
///
/// @RESTRETURNCODE{200}
/// Description was returned successfully.
///
/// @EXAMPLES
///
/// @EXAMPLE_ARANGOSH_RUN{RestAdminStatisticsDescription1}
///     var url = "/_admin/statistics-description";
///     var response = logCurlRequest('GET', url);
///
///     assert(response.code === 200);
///
///     logJsonResponse(response);
/// @END_EXAMPLE_ARANGOSH_RUN
/// @endDocuBlock
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