Heads up: caching changes in head branch

Hi,

I've just implemented a smarter workaround for mod_gzip bugs in the
head branch of Polipo.  Unlike the previous workaround, it's cheap
enough to be enabled by default.

The workaround is controlled by the variable dontTrustVaryETag.  If
false, servers are assumed to be compliant.  If true, ETags are
ignored on objects with vary, as before.

If this variable is maybe (the default), Polipo will check the values
of Content-Type and Content-Encoding before trusting an ETag.  This
should work around mod_gzip and mod_deflate, but not necessarily other
buggy servers.

It's completely untested, so feedback is warmly welcomed.

                                        Juliusz

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