[MERGE][1.6] Cause a full index read when a single index query is larger than 1/20th the index capacity.

[John Arbash Meinel]

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Robert Collins wrote:
> This improves log back to 1.3 speeds, largely fixes 'log file', and also
> appears to benefit annotate.
> 
> Please give it a whirl if 1.6 has been feeling sluggish to you.
> 
> -Rob
> 

BB:approve

As discussed on IRC, I'll bring this into 1.6.

John
=:->

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