Davies Liu: merge slow writes into larger one by every seconds.

delay first write by 1 second. cancel the delay when flush or end.
Davies Liu: skip blank line when parsing topology.cfg
Davies Liu: NoAtime: do not update atime and reduce ACCESS in changelog

merge patch from Travis Hein <marsairforce@gmail.com>
Davies Liu: do not report space when all changes < 0.5%
Davies Liu: refactor: fix hash collision in loop buffer
Davies Liu: use kqueue in master/matoclserv.c
Davies Liu: epoll in matoclserv.c