[Http-crcsync] crccache ready for some testing I think

[Toby Collett]

Hi,
I have fixed up a couple of critical bugs in the crccache modules and I feel
that the code is now able to be tested a little bit wider. For an unchanged
upstream file you get high 90% size saving, this can drop off pretty
sharply, a 'two lines changed' copy of w3.org homepage only got 75% savings,
but that isnt too shabby either.

Lots of work to be done tuning the cache etc as Alex has pointed out, but at
this point you should be able to browse over the link (whether it is slower
or faster is another question)

The modules should still build against any recent apache build, so you
shouldnt need to compile all of apache. Basic example configs for ubuntu are
in the git repo and also instructions for suse.

The server end will print out stats for transmission size at the end of an
encoded response. This does not take into account the additional header size
for the request.

Toby

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