• Changes for the select() function
• There is no more case_() function, receive_case() should be used instead
• select() now supports sending of messages
• select() returns mchain_select_result_t instead of mchain_receive_result_t
• A fix for enveloped messages and transfer_to_state(), and suppress() helpers
• New enum event_handler_kind_t and change in format of so_create_event_subscription()