also fix a bug formatting the timestamp

	- reader thread takes the freelist before running

	the incomplete formatter

	- read config files
	- read closing tags for *both* client and backend requests

	- added debugging
	- read closing tags for client and/or backend requests

	output formats now compiled at init time
	and formatted with callbacks at runtime

	- stats/monitoring for data length overflows

	     - fd table is static in varnishevent.c
	     - mutexing SPSCQ enqueue and dequeue
	     - writer flushes only when waiting

             - fixes for empty data fields
             - preliminary fix for SessionOpen, SessionClose & SessStat

              - fixed a bug parsing fields from data
              - now ignoring SessionClose and StatSess

wrk_herder_thread and wrk_herdtimer_thread causing bogus n_wrk_max
stat increments.

Fixes: #1183