Last -need-bytes kept to test that it still works.

Also reappropriate test a00001 to exercise the Teken code with
the vttest (http://invisible-island.net/vttest/) program, if installed.

This allows us to use TERM=xterm.

default options:

For co-existance with libc malloc and potentially other allocators, we
should use mmap() regions in favor of sbrk(). Also, libumem's perthread
cache only makes sense when umem is actually used for all allocations
and, by default, requires an additional massive 1MB per thread, which
is totally out of scale with how we manage memory in varnish.

if libumem is found to already be loaded, we cannot set its options,
so warn about that fact.

As we only use function pointers to libumem, lazy loading of symbols
should be the better option.

libumem's atfork handler will redefine malloc() and friends so if we
load it in the manager, we cannot confine its use to the stevedore

We do this by not linking with libumem, but rather using dlopen/dlsym
to load the slab allocator interface, which is used by the stevedore.

Also report success/failure earlier.

Required for make distcheck.

Spotted by geoff.

Ref #2622

Also give irc notifications a try.

Discussed with phk and geoff.

Mostly adding it here for documentation purposes.

I hadn't realized how unsuitable vtc_varnish was to copy from,
because of the dual process complications, this simplifiles
things back again.

Move -D and -W out of -arg, it makes no sense to have to pull
them out of there again.

Add -conf-OK and -conf-BAD arguments.

handling.

Add -conf+backend to automatically produce backend confs
from list of servers

Enforced for HTTP/1.1 requests. To disable it use -nohost.