Reduce scope of heritage.h
Reduce scope of libvcl.h

Fixes #1042

Conflicts:

	bin/varnishd/mgt/mgt_param.c

it belongs there.

params much clearer.  Manager should never read the childs copy.

of maintaining magic hex-bit values that must match.

Use a mark&mark strategy to test all obj.* bans even if there are
req.* bans in the way.

Set the default total transfer time to 600s.

Retry if we hit a TCP timeout if some data was sent and only error out
when we get an error or no data was sent in the time period.

started fixing that, and then I fixed another couple of nits and polished
the naming a bit and ...

Well, you know how it is.

Changed the backend matching function to take a call-back function
to eliminate the need for the memory which got leaked.

This meant that backend.list could also use it, if only the parsing
code accepted a blank input.

So I rewrote the parsing code to also allow empty names, so you can:
	backend.list (:80)
	backend.list (192.168)
etc.

And then I added a summary report of the probing, if it is happening,
and explicitly say that no probing is happening if it isn't.

Drop varnishsizes, since it's pointless now (you can get the same
functionality with varnishhist -p size)

This reverts commit 5f45e4ca.

Make it possible to mark backends as sick or healthy by way of

  backend.set_health $backendname (sick|healthy|auto)

document gzip'ed.

Fixes	#1029