panic_string to syslog until we have washed it.

Previously it said `vcl_all' which doesn't exist.  Minor cosmetics while
I'm here.

Partially addresses #1795.

This was missing on my previous commit.

Disabled by default. Prompted by Rafael Zalamena
(rafaelfz at taghos dot com dot br) on varnish-dev.

From minusf via github with minor tweaks.

For those cases where you want to send a different reason
message, but use the normal status code.

Noticed by Kacper when doing 301/302 in vcl_synth().

A very minor spelling fix for something I noticed whilst reading the source
for CIDR notation inside ACLs.

understood.

Until I get a burst of inspiration, let's not release a blatant TODO in
the  docs.

Better ordering of the topics, and hopefully better wording overall.

This is to not leak the size of struct object to stevedores that might
have their own cache_obj.c implementation.

Minor fixes for FreeBSD by:	phk

From Carlos Abalde (carlos-dot-abalde-at-gmail-dot-com) with comments
from Dridi and phk.

  r287541 | dim | 2015-09-07 20:55:14 +0000 (Mon, 07 Sep 2015) | 7 lines

  In libz's inflateMark(), avoid left-shifting a negative integer, which
  is undefined.

  Reviewed by:    delphij
  Differential Revision: https://reviews.freebsd.org/D3344
  MFC after:      3 days

in c709e110.

Spotted by:	Martin
Test-case by:	Martin

we hit stp_error and make a new object.