- 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

If the ban lurker finds a busy object, skip the object and defer the
checking to a later pass.

No test case because it is very timing sensitive (but see the trac bug
report for a VTC-file that mostly triggers it on the 3.0 branch only)

Fixes: #1162

There is a short window of opportunity between HSH_Insert() and
HSH_Unbusy(), where the locks are released and the expiry thread can
try to expire an object that is still busy (for objects with very
short TTL). This patch makes the expiry thread check for busy objects
and wait if the head of the binheap is busy.

No test case as the window is too small.

Fixes: #1150