in order to encapsulate the lack of of API coordination between
different OS's in this arena.

This only affects development environments on FreeBSD, but hopefully
exposing the Varnish source code to yet another compiler will help
expose bugs.

Fixes #821

previously known as purge" to ban.

The sphinx configuration includes the version number, so generate the
configuration.

Spotted by:	Geoff

The director is freed in vcc_backend.c already, so don't free it in
vcc_dir_dns.c too.

Fixes: #863

err_ttl:
	Pointless and wrongly documented.  Remove and set Retry-After:
	in default.vcl
expiry_sleep:
	Remove misleading advise.
send_timeout:
	Reduce to one minute, 10 minutes was far too long.
ban_lurker_sleep:
	Reduce sleep between successful evictions to 10msec to speed
	ban lurker up to max 100 objects/second.

it has its own parameter.

before we start setting them otherwise.

"thread_pool_workspace"

http_headers is now called http_max_hdr and covers both requests and responses.

http_{req|resp}_size sets an upper limit on requests and responses, and
we (still) summarily close the connection if it is exceeded. (default: 32k)

http_{req|resp}_hdr_len sets the max size for any HTTP header line
except the first line (URL/response). (default 512)

Fix up the generation of vcs_version.c with the assumption that if you
have a .git directory at the top, you have git installed.  Drop logic
for handling svn checkouts.

There is no reason for libvmod_std to have a version number, so drop
it and adjust test cases accordingly.