s2_delaywork ready for commit

G'day,

I believe this phase of the delay pools ACL and statistics work is ready
for commit to Squid-2. I've shuffled around the configuration file changes
a bit and used PRIu64 for printf().

http://www.creative.net.au/diff/s2_delaywork.diff

I'll commit it to Squid-2.HEAD this weekend if noone has any further objections.

Adrian

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