This is regular patch release. With new feature implemented - process groups.
Feature #739 - Singleton process groups and delayed queue support
Bug #810 - Invalid counter used for <restart_min>, <restart_step> and <restart_max> at respawn checking
Bug #811 - tpext_addperiodcb() for certain load types, callback may be called with longer intervals, than specified in 'secs' parameter
Bug #812 - tpbridge in -f mode may fail to send BFLD_CHAR field with value 0x00
NOTE: When upgrading, Feature #739 requires full instance stop accompanied by "$ xadmin down -y".