Update board members, URLs, spelling and fmt(1).

The disembarking thread would clear the req->wrk pointer in
CNT_Request. The req could have already been rescheduled on another
worker at this point, causing the req->wrk to be cleared while
processing. Change back to not clearing the pointer for
REQ_FSM_DISEMBARK (it's already been done under mutex in HSH_Lookup
anyways).

Fixes: #1488

backend IMS.

When revalidating using backend IMS, copy the status code, status
code, status string and response message from the original object into
the new revalidated object. This makes sure that none of the 304
message fields gets applied to the new revalidated object.

Fixes: #1485

The Age reported on response objects is calculated from the last
request timestamp taken. For a cache hit that hasn't been on a
waitinglist, that will be the Start timestamp. This opens a race where
the requests' last timestamp could be before the objects t_origin.

Truncate the Age to zero rather than assert in that case.

Fixes: #1486

If one runs configure with --without-rst2man or no rst2man is found,
the value is "no", not an empty string.  Handle this correctly in
configure.

Fixes: #1473

specific user and/or group may execute it. Varnish never inherited
the groups of the user that has been specified by "-u". initgroups()
will make sure that varnish gets all supplementary groups.

Submitted by:	Christian Ruppert
Fixes	#1482

who made them with Coccinelle.

Thanks!

Fixes #1480

Pointed out by dharrigan in #varnish.

Before, the origin time for the objects was defined as the time we
received the full request from the client that initiated the
fetch. Now we use the time we received the response headers from the
backend.

The EXP_Touch and the Age header will be based off the last timestamp
taken. This can be slightly inaccurate, but saves us from having to do
another timestamp for them.

Fixes: #1475

backend. Set it on the object if missing.

Previously we would add an explicit Date header on each response with
the time and date of the response, overwriting any Date header on the
object that came from the backend.

Now we will add a Date header if the backend didn't supply one just
before vcl_backend_response() is run, and not add any Date headers for
the replies.

This change means Date headers sent by Varnish is approximately the
time and date this object was generated by the backend, and not the
current date and time.

While here fmt(1) the text.

Introduce new section for new parameters

Spotted by:	Ruben

We need req.backend_hint in vcl_hit to enable different
grace times depending on backend health.

size.

Fixes: #1469

Fixes: #1468

Fixes: #1462