[PATCH] 64-bit counter

[Evan Miller]

Per the previous discussion about counter wraparounds, some people 
thought that a 64-bit counter could sidestep some of the pain of 
adapting client code to deal with a wraparound. It's possible 64-bit 
counters could introduce as many problems as they solve; I really don't 
know the client libraries well enough to say (let alone everyone's 
database schemas, etc.). Regardless, I threw together a patch to support 
increments up through 2**64. It is attached.

I'm actually indifferent to whether counters are 32 or 64 bits, but 
perhaps someone else can assess the breakage that moving to 64 bits will 
wreak. All I know is that wraparound is probably the "correct" behavior, 
and I'd like to see one patch or the other integrated. Thoughts?

Evan
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