@startDocuBlock JSF_get_admin_database_version @brief returns the version of the database. @RESTHEADER{GET /_admin/database/target-version, Return the required version of the database} @RESTDESCRIPTION Returns the database-version that this server requires. The version is returned in the *version* attribute of the result. @RESTRETURNCODES @RESTRETURNCODE{200} Is returned in all cases. @endDocuBlock