Range>>at: patch

[Brian T. Rice]

Ken Causey wrote:

> This patch has a couple of points.
> 
> 1.  It was not checking the indices correctly and was needlessly using
> the step twice.  Lee caught this before me.
> 
> 2.  at: 0 didn't work even though that should be the first value in the
> range.
> 
> 3.  It was not limitting the argument to an Integer and family.  I'm
> assuming here that Range is meant to be non-continuous.  I'm also not
> sure if this is the best way to do it or not.
> 
> Ken

It looks good, although I modified it to use isCloseTo: (which uses 
SingleFloat tolerance) and keyNotFoundOn:, although that isn't really 
precise enough - I just don't like error: if I can avoid it.

We can generalize the keys to be Magnitudes, in principle. I'll keep it 
as Integer until someone hollers.

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