[racket-dev] path->relative-string/setup

I've restored `path->relative-string/setup'.

My intent was to replace it with the function that is currently called
`path->relative-string/setup/pkg', but I think there was some
dependency issue, or maybe I was worried about new dependencies. I'll
take another look at it.

At Fri, 21 Jun 2013 14:50:16 -0400, Asumu Takikawa wrote:
> Hi all,
> 
> It looks like in the recent pkg reorganization, the function
> `path->relative-string/setup` has disappeared from the
> `setup/path-to-relative` module.
> 
> As a result, XREPL's ,enter doesn't work anymore and possibly other
> things. Is this an intentional omission or was it just lost by accident?
> 
> Cheers,
> Asumu
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