implementation bits.  Still not there, but getting closer...

Now bereq.backend is the backend or director we chose, whereas
beresp.backend is the actual backend, after directors have done their
picking and choosing, which sent us the reply.

Constify the VCL_BACKEND datatype.

This is called recursively until we get to the bottom of the pile.

Doing it this way means that "pick one" directors dont need to know
about other methods on directors and can concentrate on just picking.

It also prevents us from eating up a lot of stack.

Round up vary length to make sure that the object workspace can take
the rounded up Vary string without overflowing.

backends.

(VDD14q3 item)

(VDD14q3 item)

Fixes #1598

linebreaks in panic messages.

NULL test in the middle of things.

in all VCL_methods.

Apologies for the previous breakage.

This reverts commit 890a45ae since it broke
master.

Make the test case pass again on i386. (el5, el6, osx)

This started to fail on September 15th, assumed after the changes
to the Obj* API.

Thanks to fgs for noticing.

Closes	#1594

Initial patch by Meng Zhnag - jammy.linux@gmail.com

Fixes #1546

struct worker for "usual stuff" like vsl, stats etc.

function arguments.