maximum request size ACL diff

Hi,

Here's a small diff (thanks to benno!) which implements a simple fast
ACL lookup for the maximum request size. This allows Squid administrators
to restrict POST/upload sizes based on a variety of available request
information.

I'd like to commit this to Squid-2.HEAD, squid-2.7 and if possible,
Squid-2.6.

Thanks,

Adrian

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