/**
 * Get requirement
 *
 * @param struct $args
 * @param string $args["devKey"]
 * @param string $args["testprojectid"]:
 * @param int $args["requirementid"]:
 * OPTIONAL, if not present, reqdocid must be present
 * @param string $args["requirementdocid"]:
 * OPTIONAL, if not present, reqid must be present
 * @param string $args["version"]
 * OPTIONAL
 * @param string $args["requirementversionid"]
 * OPTIONAL
 * If neither version nor versionid are present, the latest version is used
 *
 * @return mixed error if someting's wrong, else a requirement version
 *
 * @access public
 */
 public function getRequirement($args) {