CacheFu overhaul

Hi all--

I am doing an overhaul of CacheFu.  I have fixed (I think) all the
outstanding bugs, and I have completely revamped the way that CacheFu is
configured.  Once you get your squid.conf and httpd.conf files right,
setup should much easier: pretty much all cache settings are now
controlled from portal_cache_settings (navigate to it in the ZMI, then use
the View tab to actually do something useful).  No more script
customizations should be required.

The new code is in svn in the geoffd-cachefuageddon branch.

I've added lots of unit tests, and they all pass, but I still haven't done
much testing with an actual squid instance.

NOTE: if you have an existing cachefu setup with squid behind apache, you
will need to modify your httpd.conf file and squid.conf files slightly.

A few things: several content types do not invoke caching policy manager
to set their headings.  I believe this includes Files, FSFiles, Images,
FSImages, and possibly ATFiles and ATImages (at least for the downloads). 
I don't really care for my use case, but it would be nice to have these
controlled by a sane caching policy.  Patches gratefully accepted.

I think content gzipping will now work, but I haven't tested it at all. 
Assuming it works, your content will be stored pre-gzipped in the cache.

Geoff





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