For security reasons, we run the C-compiler in a sandbox process
which by default uses the same (non-)privileges as the other sandboxes
(VCL compiler, test-loader process and the worker process).

On some systems access to the C-compiler is limited, also for reasons
of security, and varnishd will fail to compile VCL code, unless all
the sandboxes are given access to the C-compiler.

Add a new parameter "group_cc" which adds a single gid to the grouplist
of the sandbox which executes the cc_command, for the benefit of such
systems.

Do some slightly related polishing of the docs/help-texts in this area
while here anyway.

Fixes #1521

Leave shm_reclen as a parameter alias for now.

Parameter vsl_buffer must be 12 bytes larger than vsl_reclen in order
to avoid a panic when we try to put 12 pounds of VSL into a 5 pound
vsl_buffer sack.   Tweak the opposite parameter Minimum or Maximum value
when we set one of of these parameters.

Fixes #1547

This reverts commit 78126742 since it broke master.

Fixes #1555

HTTP message.  Presently supported "req", "bereq", "resp", "beresp".

This is now possible because synth responses do not go through
deliver any more, as error responses used to.

Patch by:	Nils Goroll

Much appreciated

files involved in a given VCL.

When using -v, the individual source files are output like this:

	// VCL.SHOW %d %d %s\n%s\n

First field is the source file index [0...].
Second field is the number of bytes in the source file.
Third field is the name of the source file.
Fourth field is the source file content.

Inspired by a patch from daghf

out here and need a SLT_End record.

Backend restarts are now return(retry).

Fixes:	#1503

Submitted by:	Gauthier Delacroix via github

the object instantiation until needed.

sphinx-build v0.6.6 which is on RHEL6/CentOS6 does not know about -n,
so we'll have to do without it for now.

Reported in:	#1535