if sub is null (because it's the contents of a non-existing header),
pretend it's "" instead.

have decided what the strategy is going to be for synthetic in
the future.

Fixes	#545

Fixes: #1076

to 512 bytes on epoll systems.

(incl memitem) down to 512 bytes, despite ridiculously large
sockaddr_storage structs.

us 8 bytes per allocation.

impossible to deal with correctly.

Pointed out by:		Dong Feng

Fix sess mempool names

stats counters as worker-local unless they actually are.

need it during vcl_hash{}

in as paramters to shave a few source lines

Retire a tiresome testcase to .disabled.

Constify some VRT prototypes.

I'm not quite there yet, but in the end we will have two workspaces:
req->ws for req.* and resp.* and busyobj->ws for bereq.* and beresp.*

Various argument changes as consequence of the sess->req moves.

a run of the mill mempool.

do not run in production!

Allocate the workspace as part of struct req, and move sp->ws,
sp->http and sp->http0 to struct req.

Allocate the req->http[0] on the workspace, so that changes to
nhttp does not force us to dump the mempool.