////////////////////////////////////////////////////////////////////////////////
/// @startDocuBlock JSF_delete_api_aqlfunction
/// @brief remove an existing AQL user function
///
/// @RESTHEADER{DELETE /_api/aqlfunction/{name}, Remove existing AQL user function}
///
/// @RESTURLPARAMETERS
///
/// @RESTURLPARAM{name,string,required}
/// the name of the AQL user function.
///
/// @RESTQUERYPARAMETERS
///
/// @RESTQUERYPARAM{group,string,optional}
/// If set to *true*, then the function name provided in *name* is treated as
/// a namespace prefix, and all functions in the specified namespace will be deleted.
/// If set to *false*, the function name provided in *name* must be fully
/// qualified, including any namespaces.
///
/// @RESTDESCRIPTION
///
/// Removes an existing AQL user function, identified by *name*.
///
/// In case of success, the returned JSON object has the following properties:
///
/// - *error*: boolean flag to indicate that an error occurred (*false*
///   in this case)
///
/// - *code*: the HTTP status code
///
/// The body of the response will contain a JSON object with additional error
/// details. The object has the following attributes:
///
/// - *error*: boolean flag to indicate that an error occurred (*true* in this case)
///
/// - *code*: the HTTP status code
///
/// - *errorNum*: the server error number
///
/// - *errorMessage*: a descriptive error message
///
/// @RESTRETURNCODES
///
/// @RESTRETURNCODE{200}
/// If the function can be removed by the server, the server will respond with
/// *HTTP 200*.
///
/// @RESTRETURNCODE{400}
/// If the user function name is malformed, the server will respond with *HTTP 400*.
///
/// @RESTRETURNCODE{404}
/// If the specified user user function does not exist, the server will respond with *HTTP 404*.
///
/// @EXAMPLES
///
/// deletes a function:
///
/// @EXAMPLE_ARANGOSH_RUN{RestAqlfunctionDelete}
///   var url = "/_api/aqlfunction/square::x::y";
///
///   var body = { 
///     name : "square::x::y", 
///     code : "function (x) { return x*x; }" 
///   };
///
///   db._connection.POST("/_api/aqlfunction", JSON.stringify(body));
///   var response = logCurlRequest('DELETE', url);
///
///   assert(response.code === 200);
///
///   logJsonResponse(response);
/// @END_EXAMPLE_ARANGOSH_RUN
///
/// function not found:
///
/// @EXAMPLE_ARANGOSH_RUN{RestAqlfunctionDeleteFails}
///   var url = "/_api/aqlfunction/myfunction::x::y";
///   var response = logCurlRequest('DELETE', url);
///
///   assert(response.code === 404);
///
///   logJsonResponse(response);
/// @END_EXAMPLE_ARANGOSH_RUN
/// @endDocuBlock
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